You're best bet is the 7770i mean that can handle games like bo2, gta iv and games like that..
There really isn't a sub-$100 graphics card that can handle games.
How much will it cost? Don't think my pc can handle those cardsYou're best bet is the 7770
Honestly though, the performance won't be that great. If you're serious about gaming, then I would save up for AT LEAST a 750 ti or 270x.
A 750ti is $150 and a 270x is $200.
What do you have for a PC right now?