Bunches of them, to say the least. A good place to start looking would be newegg, as you can search by price and such. A lot of places are trying to unload the Radeon 4xxx series cards, so you may find a decent deal with one of those.
+1 to the $99 ATI 4850. Its a great deal for the price.
Just to be certain you can run it you should probably post your system specs for us too. Your power supply and monitor resolution are particularly important.