So, after 13 updates, here a few thoughts :

- Amazon, Best Buy and Gamestop lists are updated regularly and items are ranked based on sales over a short period of time (hourly or daily). Walmart and Target are different with items moving way slower suggesting the ranking is based on sales over a longer period of time (which would not be really useful for what we are trying to do here...)
I will keep them for now but what do you guys think ?

- I will wait for March NPD results to confirm but I think I will have to change the point system to award more points to the items in top 20, top 10. As it is right now, I think the point system is giving too much point to console with loads of SKUs, even if each SKUs rank low. How I see it : #100 = 1 point ; #99 = 2 points ; ... ; #21 = 80 points ; #20 = 82 points ; #19 = 84 points ; ... ; #11 = 100 points ; #10 = 105 points ; #9 = 110 points ; ... ; #1 = 150 points.
Again, what do you think ?

- Off course, "weighting" retailers will be a thing as well. We'll decide how and how much after March NPD.

Other ideas ?

Yes for the first point and you can already include known market shares of each retailers. Problem is to find those numbers, they were regularly posted on Neogaf.

Great job, I hope you'll continue your work.

Yeah thats the other thing, Amazon is like 5% of the market, while Best Buy and Gamestop are much bigger %'s.

Another idea could be to take the avg of all the differnt scores.
Since its overtime differnt.

Mad props for all the work this takes though.
I far believe this is the best way to predict a NPD we have ever had, and Im pretty sure this will be more often right than just amazon thread.

problem with best buy is we don't know which results are the right ones, different searches yield different results. 

How is 3DS Sammus the highest selling Nintendo SKU at Gamestop?? Lol

Interesting... 

I think this will be A LOT closer to reality than those Amazon threads.

24 hours from last update :

- Amazon :

1 (-) - Nintendo Switch Neon - 14 (-) - 299.00$ - In stock
2 (+1) - Playstation 4 Slim 1Tb Black - 29 (+3) - 299.00$ - In Stock April 6
3 (-1) - Nintendo Switch Grey - 33 (-2) - 299.00$ - In stock
4 (-) - Super Nes Classic - 34 (+8) - Third Party Sellers Only
5 (+1) - Xbox One S 500Gb White - 58 (-8) - 244.95$ (-0.04) - In Stock
6 (-1) - Playstation 4 Pro 1 Tb Star Wars - 59 (-16) - 398.00$ - In Stock
7 (+2) - XBox One X 1 Tb - 63 (+24) - 497.93$ (-1.07) - In Stock
8 (-1) - Playstation 4 Pro 1 Tb - 70 (-11) - 399.00$ - In Stock
9 (-1) - Playstation 4 Slim 500Gb Black - 81 (-10) - 269.00$ - In Stock
10 (R) - Playstation 4 Pro 1 Tb God of Wars - 89 (R) - 399.00$ - Currently Unavailable

Out of Top 100 :

10 (-4) - XBox One S 1Tb Playerunknown's Battlegrounds - 92 (-43) - 285.98$ (+40.99$) - In stock

PS4 : 72 + 42 + 31 + 20 + 12 = 177 points (-22) ; XBO : 43 + 38 = 81 points (+7) ; NS : 87 + 68 = 155 points (-2)


- Best Buy :

1 (+2) - Playstation 4 Slim 1Tb Black - 5 (+14) - 299.99$
2 (-1) - Nintendo Switch Neon - 7 (+4) - 299.00$
3 (+3) - XBox One X 1 Tb - 12 (+21) - 499.99$
4 (+1) - Playstation 4 Pro 1 Tb - 13 (+15) - 399.00$
5 (+3) - XBox One S 1Tb Playerunknown's Battlegrounds - 14 (+33) - 299.99$ (+50.00)
6 (-2) - Nintendo Switch Grey - 19 (+3) - 299.00$
7 (+2) - XBox One S 1Tb Sea of Thieves - 24 (+33) - 299.99$ (+50.00)
8 (-6) - Playstation 4 Pro 1 Tb God of Wars - 38 (-20) - 399.99$ - Preorder
9 (-2) - XBox One S 1Tb Starter Bundle - 42 (-1) - 299.99$ (+50.00)

Out of Top 100 :

-

PS4 : 96 + 88 + 63 = 247 points (+9) ; XBO : 89 + 87 + 77 + 59 = 312 points (+86) ; NS : 94 + 82 = 176 points (+7) ; 3DS : 0 points (-)


- Gamestop :

1 (-) - Playstation 4 Pro 1 Tb God of Wars - 7 (+4) - 399.99$ - Preorder
2 (-) - Playstation 4 Slim 1Tb Star Wars Battlefront 2 - 43 (+4) - 299.99$
3 (-) - XBox One X 1 Tb - 62 (-14) - 499.99$
4 (+1) - Playstation 4 Pro 1Tb Glacier White - 69 (+19) - 399.99$
5 (-1) - XBox One S 500Gb Minecraft - 72 (-4) - 279.99$
6 (+4) - Nintendo Switch Neon - 108 (+22) - 299.00$
7 (-) - Playstation 4 Pro 1 Tb Star Wars - 116 (+8) - 399.99$
8 (+1) - XBox One S 1Tb Sea of Thieves - 132 (-6) - 299.99$
9 (-1) - Nintendo Switch Neon + Zelda Bundle - 153 (-28) - 359.99$
10 (-4) - Nintendo NEW 3DS XL - Samus Edition - 189 (-88) - 199.99$

Out of Top 100 :

11 (-4) - Nintendo Switch Neon + Mario Odyssey Bundle - 132 (-16) - 359.99$
12 (-3) - XBox One S 500Gb Forza Horizon - 171 (-47) - 279.99$

PS4 : 97 + 79 + 66 + 43 = 283 points (+15) ; XBO : 70 + 65 + 35 = 170 points (-27) ; NS : 47 + 24 = 71 points (-38) ; 3DS : 6 points (-44)


- Walmart :

1 (+9) - Nintendo 2DS Mario Kart 7 - 7 (+32) - 79.99$
2 (+6) - XBox One S 1Tb Playerunknown's Battlegrounds - 18 (+14) - 298.95$
3 (+9) - XBox One S 1Tb Rocket League - 23 (+29) - 299.00$
4 (+5) - XBox One S 500Gb Hotwheels/Forza Bundle - 41 (-6) - 254.89$
5 (+6) - Playstation 4 Pro 1 Tb God of Wars - 42 (+6) - 399.96$ - Preorder
6 (-4) - Playstation 4 Slim 1Tb Black - 45 (-26) - 299.99$
7 (R) - Xbox One S 500Gb White - 46 (R) - 230.90$
8 (-4) - Playstation 4 Slim 500Gb Black - 47 (-20) - 269.00$
9 (-4) - XBox One X 1 Tb - 48 (-20) - 499.99$
10 (-9) - Nintendo Switch Neon - 49 (-41) - 299.00$
11 (-8) - Nintendo Switch Grey - 51 (-30) - 299.00$
12 (-5) - Playstation 4 Pro 1 Tb - 52 (-22) - 399.00$
13 (R) - Nintendo 2DS New Super Mario Bros 2 - 55 (R) - 79.99$
14 (-1) - XBox One S 1Tb Sea of Thieves - 62 (-9) - 249.99$

Out of Top 100 :

6 (-) - Playstation 4 Pro 1 Tb Star Wars - 29 (-) - 399.00$
14 (-) - XBox One S 1Tb Assassin's Creed Origins - 67 (-) - 309.00$

PS4 : 59 + 56 + 54 + 49 = 218 points (-134) ; XBO : 83 + 78 + 60 + 55 + 53 + 39 = 368 points (+29) ; NS : 52 + 50 = 102 points (-71) ; 3DS : 94 + 46 = 140 points (+78)


-Target :

1 (-) - Nintendo Switch Neon - 5 (-1)
2 (-) - Nintendo Switch Grey - 15 (-2)
4 (-) - Playstation 4 Slim 1Tb Black - 19 (-)
5 (+1) - Playstation 4 Pro 1 Tb - 45 (+2)
6 (-1) - Xbox One S 500Gb Minecraft - 48 (-3)
7 (-) - XBox One S 1Tb Playerunknown's Battlegrounds - 61 (-2)
8 (-) - XBox One X 1 Tb - 62 (-2)
9 (-) - Playstation 4 Pro 1Tb Star Wars Battlefront 2 - 67 (-4)
10 (-) - Nintendo 2DS Mario Kart 7 - 96 (-3)

Out of Top 100 :

-

PS4 : 82 + 56 + 34 = 172 points (-2) ; XBO : 53 + 40 + 39 = 132 points (-7) ; NS : 96 + 86 = 182 points (-3) ; 3DS : 5 points (-3)

Overall (Today) :

1 (-) - PS4 : 1097 points (-134)
2 (-) - XBO : 1063 points (+88)
3 (-) - NS : 686 points (-107)
4 (-) - 3DS : 151 points (+31)

Walmart list completely has totally changed in the last 24 hours. I am starting to think the list we see right now corresponds to sales that happened earlier (during XBO price cut) because it makes little sense to see a rise now when the promotion is over...
We will have to observe longer to confirm this (or not).

Xbox tends todo really well in Walmart.

Are the charts for best buy and Gamestop just for online sales because we have to consider that. 

48 hours from last update :

- Amazon :

1 (-) - Nintendo Switch Neon - 20 (-6) - 299.00$ - In stock
2 (-) - Playstation 4 Slim 1Tb Black - 34 (-5) - 299.00$ - In Stock
3 (+1) - Super Nes Classic - 36 (-2) - Third Party Sellers Only
4 (R) - New Nintendo 2DS Black + Turquoise - 37 (R) - ?? - In Stock
5 (-2) - Nintendo Switch Grey - 38 (-5) - 299.00$ - In stock
6 (+2) - Playstation 4 Pro 1 Tb - 49 (+21) - 399.00$ - In Stock
7 (-2) - Xbox One S 500Gb White - 60 (-2) - 248.00$ (+3.05) - In Stock
8 (-1) - XBox One X 1 Tb - 80 (-17) - 495.00$ (-2.93) - In Stock
9 (-3) - Playstation 4 Pro 1 Tb Star Wars - 88 (-29) - 398.00$ - In Stock
10 (-1) - Playstation 4 Slim 500Gb Black - 90 (-9) - 269.00$ - In Stock

Out of Top 100 :

10 (R) - Playstation 4 Pro 1 Tb God of Wars - 89 (R) - 399.00$ - Currently Unavailable

PS4 : 67 + 52 + 13 + 11 = 143 points (-34) ; XBO : 41 + 21 = 62 points (-19) ; NS : 81 + 63 = 144 points (-11) ; 3DS : 64 points (+64)


- Best Buy :

1 (-) - Playstation 4 Slim 1Tb Black - 3 (+2) - 299.99$
2 (-1) - Nintendo Switch Neon - 5 (+2) - 299.00$
3 (+1) - Playstation 4 Pro 1 Tb - 11 (+2) - 399.00$
4 (-1) - XBox One X 1 Tb - 13 (-1) - 499.99$
5 (+1) - Nintendo Switch Grey - 16 (+3) - 299.00$
6 (-1) - XBox One S 1Tb Playerunknown's Battlegrounds - 22 (-8) - 299.99$
7 (+1) - Playstation 4 Pro 1 Tb God of Wars - 37 (+1) - 399.99$ - Preorder
8 (-1) - XBox One S 1Tb Sea of Thieves - 42 (-18) - 299.99$

Out of Top 100 :

9 (-2) - XBox One S 1Tb Starter Bundle - 42 (-1) - 299.99$ (+50.00)

PS4 : 98 + 90 + 64 = 252 points (+5) ; XBO : 88 + 79 + 59 = 226 points (-86) ; NS : 96 + 85 = 181 points (+5) ; 3DS : 0 points (-)


- Gamestop :

1 (-) - Playstation 4 Pro 1 Tb God of Wars - 5 (+2) - 399.99$ - Preorder
2 (+1) - XBox One X 1 Tb - 41 (+21) - 499.99$
3 (+1) - Playstation 4 Pro 1Tb Glacier White - 60 (+9) - 399.99$
4 (-2) - Playstation 4 Slim 1Tb Star Wars Battlefront 2 - 87 (-44) - 299.99$
5 (+1) - Nintendo Switch Neon - 90 (+18) - 299.00$
6 (+2) - XBox One S 1Tb Sea of Thieves - 122 (+10) - 299.99$
7 (R) - Nintendo Switch Neon + Mario Kart Bundle - 135 (R) - 359.99$
8 (+1) - Nintendo Switch Neon + Zelda Bundle - 155 (-2) - 359.99$
9 (-2) - Playstation 4 Pro 1 Tb Star Wars - 157 (-41) - 399.99$
10 (R) - Nintendo Switch Neon + Mario Odyssey Bundle - 167 (R) - 359.99$
11 (R) - Playstation 4 Slim 500Gb COD: IW - 196 (R) - 299.99$

Out of Top 100 :

5 (-1) - XBox One S 500Gb Minecraft - 72 (-4) - 279.99$
10 (-4) - Nintendo NEW 3DS XL - Samus Edition - 189 (-88) - 199.99$

PS4 : 98 + 71 + 57 + 22 + 3 = 251 points (-32) ; XBO : 80 + 40 = 120 points (-50) ; NS : 56 + 33 + 23 + 17 = 129 points (+58) ; 3DS : 0 points (-6)


- Walmart :

1 (-) - Nintendo 2DS Mario Kart 7 - 7 (-) - 79.99$
2 (+1) - XBox One S 1Tb Rocket League - 28 (-5) - 299.00$
3 (+1) - XBox One S 500Gb Hotwheels/Forza Bundle - 40 (+1) - 254.89$
4 (+1) - Playstation 4 Pro 1 Tb God of Wars - 41 (+1) - 399.96$ - Preorder
5 (+1) - Playstation 4 Slim 1Tb Black - 43 (+2) - 299.99$
6 (+1) - Xbox One S 500Gb White - 44 (+2) - 230.90$
7 (+1) - Playstation 4 Slim 500Gb Black - 45 (+2) - 269.00$
8 (+2) - Nintendo Switch Neon - 46 (+3) - 299.00$
9 (+2) - Nintendo Switch Grey - 48 (+3) - 299.00$
10 (+2) - Playstation 4 Pro 1 Tb - 49 (+3) - 399.00$
11 (-2) - XBox One X 1 Tb - 50 (-2) - 444.99$
12 (+1) - Nintendo 2DS New Super Mario Bros 2 - 53 (+2) - 79.99$
13 (R) - Nintendo 2DS XL New Black and Turquoise - 54 (R) - 79.99$
14 (R) - Nintendo 3DS XL New Black and Turquoise - 58 (R) - 79.99$
15 (R) - XBox One S 1Tb Minecraft Limited - 64 (R) - 292.84$

Out of Top 100 :

2 (+6) - XBox One S 1Tb Playerunknown's Battlegrounds - 18 (+14) - 298.95$
14 (-1) - XBox One S 1Tb Sea of Thieves - 62 (-9) - 249.99$

PS4 : 60 + 58 + 56 + 52 = 226 points (+8) ; XBO : 73 + 61 + 57 + 51 + 37 = 279 points (-89) ; NS : 55 + 53 = 108 points (+6) ; 3DS : 94 + 48 + 47 + 43 = 232 points (+92)


-Target :

1 (-) - Nintendo Switch Neon - 4 (+1)
2 (-) - Nintendo Switch Grey - 15 (-)
4 (-) - Playstation 4 Slim 1Tb Black - 19 (-)
5 (-) - Playstation 4 Pro 1 Tb - 46 (-1)
6 (-) - Xbox One S 500Gb Minecraft - 54 (-6)
7 (-) - XBox One S 1Tb Playerunknown's Battlegrounds - 62 (-1)
8 (-) - XBox One X 1 Tb - 64 (-2)
9 (-) - Playstation 4 Pro 1Tb Star Wars Battlefront 2 - 73 (-6)
10 (-) - Nintendo 2DS Mario Kart 7 - 93 (+3)

Out of Top 100 :

-

PS4 : 82 + 55 + 28 = 165 points (-7) ; XBO : 47 + 39 + 37 = 123 points (-9) ; NS : 97 + 86 = 183 points (+1) ; 3DS : 8 points (+3)

Overall (Today) :

1 (-) - PS4 : 1037 points (-60)
2 (-) - XBO : 810 points (-253)
3 (-) - NS : 745 points (+59)
4 (-) - 3DS : 304 points (+153)