I bought a book from them through the Half Price Books Marketplace. When I received the book, it was the completely WRONG book! No one double checked the ISBN or even the title before sending it. Then, I had to spend my time and money to return the book. Low and behold, the book got sent back to me because it said the forwarding time had expired. NOW I have a book I didn't order in the first place and have tried to return it twice. Luckily, I found the book from a vendor that can actually read. Also, I'm glad I went through Half Price Books because they did a great job of taking care of the situation.
Double check your books BEFORE you send them and get your forwarding address taken care of for goodness sake.