You wont get CO for $15.00, You would pay for one game out of CO with that amount and if you want I am selling my Arma 2 Original CD Key for $15.00 in the other thread :)
http://www.ebay.co.uk/itm/180913455403?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649#ht_1087wt_130
http://www.ebay.co.uk/itm/180913455403?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649#ht_1087wt_130
Just selling the spare key I have which can be used on anything including steam if you choose to. Private message me if you have any questions and if you decide to buy it I will private...