Here are the final December rankings:
PS4 Star Wars basic bundle: #3
XBO Gears bundle: either #15
PS4 NDC (disc) bundle: #40
New 3DS XL (black): #41
XBO 1TB 3-game bundle: #55
Wii U MK8 bundle: #57
PS4 COD bundle: #88
Teeqoz just needs to update the OP and that'll be all she wrote for December proper.
Now for the updated Week 5 rankings:
PS4 COD bundle (standard): #27 (↓2)
PS4 Star Wars bundle: #52 (↓13)
New 3DS XL (Black): #55 (—)
XBO Gears bundle: #71 (↑1)
Since there was no update yesterday, those changes in rank may represent two days worth of changes. I guess we'll find out for sure later this week. Normally the initially ranks for the new week show up on Thursday, so if they show up on Friday then that means Amazon is now running five days behind the actual date for the weekly (and presumably also monthly) rankings.