Just want to say thanks to AU Tiger for the heads up on the MSN Promo deal. I am now a thrilled owner of a GBA SP for $80!
Also, EBGames have 10% off preoders or 25% off preowned games deals on their site every so often, so combine that with 20% MSN dollars and you could have yourself a pretty nice deal.
Circuit City also has free shipping (or you can choose to do in-store pick up).
KMart also have a 3% off coupon I believe. It's not much but it's an option...
Now to go off the topic a little...
Pikmin is an interesting genre bending experiment for Nintendo, and for the short time I spent with it, it was worth every minute. It's far from perfect, and caters to those with more niche taste in gaming, but if you are tired of cookie cutter games and want something in your gaming library that stands out from the others, you should definitely get it for $20. I can write pages on what the game is about, but if you are really interested, the best bet is probably blow $20 or just spend $5 and rent it from your favorite video store - the game can be beaten (100% completion) in about 10 hours or so.