FYE.com has the South Park: The Complete Seventh Season for a very good price after rebate.

Note : FYE doesn't have a good reputation on their rebates. Link

Pricegrabber Price : $35 ~ $53 Shipped

1. FYE Price : $26.99
2. Rebate Price : -$15.00
Final Price : $11.99 Shipped After Rebate