$20 Off Rocksmith: Guitar and Bass ($59.99)

Retailer: Gamestop

Platforms: Xbox 360 / PlayStation 3

Link: http://bit.ly/Zqfv2Z 

Rocksmith is one of the few "educational" games that I've found to actually work. With the content expanding to cover playing bass, as long as you've got an instrument and the included cable, this is as good as any weekly lesson you could go to. If you've been wanting to give this a try, but didn't like the idea of paying an extra $20 for the mandatory cable, you won't have to worry about that this week.