Cheapest i've seen MW3 delivered and their pre-owned games from past experience are in good condition:
MW3 PS3 (pre-owned): http://www.ozsave.com/ps3/games/call-of-duty-modern-warfare-…
MW3 Xbox (pre-owned): http://www.ozsave.com/xbox-360/games/call-of-duty-modern-war…
MW3 PC CD Key: http://www.ozsave.com/pc-mac/games/call-of-duty-modern-warfa…
anyone have a coupon code?