I've seen a few of interest on autoquake.com but I think you need to buy before you try, or at least that's the impression I got, which puts me off a bit. The prices look reasonable, what was your experience of them?
Its a gamble, you can pay a deposit and go view but they were over 220 miles away from me so I bought based on description and pictures. Cost £272 to get it delivered but all good, genuine car and as described - plus I had a no quibble 7 day money back guarantee.
I researched them over the internet, a lot of bad review but I was lucky. They sell 1000 cars a month apparantly so some unhappy customers to be expected.