Over the past few years, Points2Shop has hooked me up with hundreds of dollars worth of free stuff and even now I'm currently sitting with about $56 in my account just waiting to be spent. Maybe Modern Warfare 3 maybe something else, I'll wait until I hit $60 until I decide on something. Either way, yay for free games! Oh, and if $60 is too much, they have Microsoft points, Wii points, and anything else you can order from Amazon, plus gift cards to many stores including Best Buy. Check them out, they're a great site with an awesome community and support.
