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I was wondering how VGChartz tracks online retailers such as Amazon, Newegg, and Walmart.com.

I was just checking out game prices on Newegg and they have the lowest prices for brand new games. $3-8 below retail price, no tax, free shipping. Seems to be a great place to buy games, so I was wondering how VGChartz compensates for online sales, or do they not?

Only post if you know the answer.