The major USA retailers, if you were to group by similarity are in the following categories:
Massive General Stores (A):
Walmart
Target
Local chains
Electronics (B):
Best Buy
Fry's and a bunch of little others
Dedicated Game Stores (C):
Game Stop/ EB Games
Game Crazy
Toy Stores (D):
Toys R US/Kids R US
Video Stores (E):
Blockbuster
Online (F):
Amazon
Circuit City and KB Toys don't really sell games anymore. There are also alot of independent stores, particularly in cities in the west.
I would guess groups A & D are strongest for Nintendo. B is probably best for Sony followed by A, C is probably best for Microsoft followed by B.
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