Buy 2 Used Games or Accessories at GameStop, Get 1 Free

Offer valid in stores and online from March 13-15, 2009. Free used item must be of equal or lesser value. Cannot be combined with any other offers.

Online shoppers, add 3 or more used games or accessories to your cart, enter the code GSB2G1 in the promotion box, and click Activate. Your discount will be applied at checkout. Store customers, see associate for details. No dealers.

Details here.