Have got two more of these, same type of set as last time, same type of quality; used, but in excellent condition with many years of life left in them. They were my brother's cards, and he keeps his hardware in the same condition as I do. I've checked and tested them both to ensure that they're up to the standard that I'd expect if I were buying them.

EVGA GTX 670 Reference Card
Asking Price: $220+s/h
Retail Price: $250~300


EVGA GTX 670 Signature2 Edition
Asking Price: $250+s/h
Retail Price: $300~350


Set for SLI (+SLI bridge)
Asking Price: $450+s/h
Retail Price: $550~650



Prices are a bit lower since the last set due to the launch of new GPUs and the discontinuation of EVGA's line of 670s, making it much more difficult to compare retail prices with fair used ones. Overall, a set of SLI 670s will be comparable or superior to a more expensive solution such as a GTX 780. They'll work great for 1440p or 1600p gaming, if that's your cup of tea.

If you're interested in one or both cards, send me a PM or leave a post in this thread.