First off.. THANK YOU for mentioning these deals! I also picked up a copy of Cooking Mama for $20, and I'll be looking for Rayman for $20.
I LOVE Rayman Raving Rabbids! A STEAL at $20!! One of the better games for Wii, IMO. It's so addictive, and the mini games are so much fun! Not too easy that you can breeze though, but not so difficult that it's no fun either.
I have really enjoyed Raving Rabbids 2, even though it's entirely different from the first one.