Gears of War 3 $14.99

Not bad, currently $14.13 on Amazon (3rd party but fulfilled by Amazon)

http://www.amazon.com/Gears-War-3-X...&creativeASIN=B002I0H79C?tag=cheapassgam08-20

or $15.32 if you want to get it from Amazon directly.

Yeah you can get this pretty cheap at a lot of places very often. I got it for 15 over a year ago at BBY. It's around this price used at GS for you guys with credit.
Its worth the price if you haven't played it.