I've pointed some people in the direction of the EVGA refurb section.
May sound scary, but this is EVGA, and they do guarantee them for a certain amount of time. Some stores even have a year rma on them.
However, I digress, there were a bunch of 580 refurbs going around - and logically I'd expect some 680s to come. It'll be a damn cheap price.
Way back I seen some 480 cards for under £100 - now if you had an existing 480, and knew what the hell you were doing, that's quite a performance increase. More or less the same as a single 680. ... for less than £100.