Target has a Sega Fun Pack for $29 which includes this Sonic and Monkeyballs.
http://www.target.com/gp/detail.h...XS G10001

They also have Lego Star Wars which is really fun, as most of the Lego Series are, for $15. This would probably be more enjoyable then both of the above mentioned games combined and for half the price.
http://www.target.com/LEGO-Star-W...detaillink

Walmart also has Zelda: Spirit Tracks on DS for $25
http://www.walmart.com/catalog/product.do?prod...91809

Soul Calibur on the 360 for $15
http://www.walmart.com/Soul-Cali...box-360/ip/8586913

Bayonetta and Darksiders were also released today on PS3/360