Say, planning on doing any shopping at Gamestop.com? Then you would do well to take advantage of these discount codes, which you can apply at time of purchase.
15% off Console Accessories New or Used (not valid on hard drives & wireless adapters) w/ Coupon Code: ACCY15 Coupon (Exp 2/28)
16% off Used Games w/ Coupon Code: CAG16 (Exp 2/13)
Buy One Game, Get the 2nd 20% off w/ Coupon Code: FEB20 Coupon (Exp 2/28)
Shop around, though, because even with the discounts you may not be getting the best deal out there on every item.