When the NVIDIA GeForce 9600 GSO was originally released in April of 2008 it was priced slightly lower than the GeForce 9600 GT as it had lower clock speeds, but oddly enough it came with more shader processors. The EVGA e-GeForce 9600 GSO Dual-Slot Edition had an MSRP of $164.99 when it first came out, but is now just $49 after rebate and boy can it fold!
"The EVGA e-GeForce 9600 GSO Dual-Slot Edition graphics card is the card that can be had for $49.99 with free shipping, a free 2GB USB Flash drive and the retailer is Newegg! For that price you don't get a fancy factory overclocked card, but it does come with the standard clocks - 550MHz core clock, 1600MHz memory clock (effective) and 1375MHz shaders. What makes this card so interesting from a folding perspective is that it has 96 stream processors (more than a 9600 GT), is very cheap, uses little power, produces little noise (thanks to the dual-slot cooler), and can overclock like a bat out of hell..."