I live in the UK one was sold for below £300 the other for around £350 fully funtional.
Any particular reasons? I thought that it still the best card in the world atm?
I wanted to get it but I doubt my 650w PSU would accommodate the power requirements.
More about6990 selling ebay
The GTX 690/HD 7970x2 beats it. They are most likely selling it that low because of the 7970x2 and/or the GTX 690. You may need to upgrade the PSU too, but I think it should handle it as long as it has the amps to push the card.
if you have a non extreme edition processor setup you should be fine with a quality 650w psu