this would be a bit more powerful l
http://forums.anandtech.com/showthread.php?t=2230758
but if if you take rebates into account its about the same price as the cards that are much less powerful and asking a similar price.
If your really wanting to cheap out you may have to turn to ebay/craiglist and look for nvidia 8800GT,9800GT, AMD 4650 or greater AMD 5650 or greater
from my experience though some of the lower end cards are harder to find thus driving up prices on ocassion of everyone fighting over lower end parts trying to be cheap when they can get 2x the performance from a 4870 or gtx 260 for about 60 bucks or less used.
It would really help if you put a $ amount on your budget and if you had to have a new card...how cheap is cheap :>
EDit: looks like other people covered it pretty well, i was researching cards before posting so i didnt see any other post yet.