Here are some sales for anyone looking to pick up either Guitar Hero II or III at a cheap price over the next couple days. (Note: all deals may not be available nationwide, and quantities may be limited.)

Best Buy
Xbox 360 Premium with Guitar Hero II bundle - $349.99

Friday & Saturday 2 Day Sale
PS2 Guitar Hero II game only - $24.99

Circuit City
PS2 Guitar Hero III Bundle with free $10 gift card

Friday & Saturday 2 Day Sale
PS2/Xbox 360 Guitar Hero II Bundle: $59.99

Target
Friday & Saturday 2 Day Sale
PS2 Guitar Hero III Bundle with exclusive guitar controllers - $85

FYE
Friday & Saturday 2 Day sale
Xbox 360 Guitar Hero III bundle: $59.99 (after $20 mail-in rebate)