Tod S.

I was given a quote online for them to purchase my used, mint iPhone. I had the quote confirmed via email, and I shipped my item out. Once they had it in their hands, they sent me an email saying, that because of "low demand" for the item, they would give me $95 less than I was promised. Promised in writing, I might add. To make matters worse, I had decided to do business with them over two other companies offering a similar service at a similar (original) price, and both of those quotes obviously expired.

Bought a pair of windshield wipers -- which, by the way, after shipping weren't so great a deal. The included adapters only fit a limited amount of vehicles (not mine), but despite no indication in the listing of what vehicles they would or wouldn't fit, they would not take them back. Total rip-off. Stay away.
UPDATE: After contacting both the Texas BBB and AmEx, I received a refund. Still, though, would never do business with them again, but am upgrading from 1 star to 2 since they did (under pressure) refund my money.