gamestop used, 49.99, put in a dollar item so its over 50, then use ent20 and edgecard.
51-10% = 45.90 - 20%= 36.72. so you get modern warfare 2 for 35.72 and whatever else you want (you can get something that you actually want if you want another game with same discount).
overall you get it 28% off, not bad. and free shipping if you can wait the 9-12 days (although both of my orders have arrived within 6 business days