I got Polarium for the DS. Even with the expensive shipping and tax it came to $14.60, which is worth it for a decent puzzle game.
I was on the fence about getting FIFA World Cup for the DS, but the shipping went from $4.99 to something like $7.89 - not a worthwhile discount for buying more...
Same experience with my CompUSA. Almost all the Nintendo stuff is gone. I was looking for DS/GBA stuff, but Gamecube is also pretty sparse. When I asked a store clerk about the lack of DS/GBA stuff, he said they were emphasizing PSP now. Go figure.