25% off any order $100 or more at gamestop.com , until April 30. Use code 25OFF (case sensitive).
Does not apply to consoles, which is good because it means I'm not going to buy a PS3 I don't need. Also does not apply to gift cards, so no, you can't just buy a gift card and then use that to buy a console.
Surprisingly, it DOES apply to preorders. So, Mario Galaxy 2, 25% off, if you buy more stuff with it.
I only have two Wii remotes, so I'm interested in getting more of those. Might check out the Nyko Wand+, though nobody seems to have actually USED the damn thing yet. I don't have any MotionPlus games, but I HAVE played NSMBW at somebody else's place, and the dongle is not friendly toward a sideways controller.
Also like the look of the Classic Controller Pro. And apparently you can get it in a $55 (before discount) bundle with Monster Hunter Tri. Which I have never heard of (or perhaps did but promptly forgot it because of its could-not-possibly-be-more-generic name), but apparently it's a big goddamn deal in Japan.