GameFly cuts $5 off each used game for PlayStation 3, Xbox 360, Nintendo Wii U, Nintendo DS, and other consoles. (The coupon should automatically apply in-cart; that makes it $5 off one game, $10 off two, $15 off three, and so on.) With many items qualifying for free shipping, that's the best compounding dollar-off coupon we've seen on these games from GameFly. (Shipping starts at $2.98 for those without free shipping.)
Of note, if you don't see the discount in-cart, apply coupon code "BFS2013ITEMONE".