My first order was cancelled because the seller didn't ship the book in the timeframe given. Okay, fine, things happen. I decided to give them another chance because of their low prices, and ordered the same book from a different seller. Not the next day, not even two days, FOUR days later my order was cancelled again due to the seller listing the book 'in error', whatever that means.
These issues have lost AbeBooks my business, which is a shame cause I buy a lot of both used & new books. I'll stick with Amazon and pay a little more cause I know without a doubt that I'll actually get what I order.