What are 8800 GT's worth these day?

8800GT is old fashion, you better try the HD4850.
Better performance-same price.

i saw a EVGA8800GT 512 for $97 AR at Fry's

I think ATI is best choice at this moment
4850 can beat 9800GTX

ya, but its twice as much as the GT

second hand practically nothing unless you sell via ebay...