I ordered a used book marked with "acceptable condition", but when I received it, the book is broken in the middle along the join and taped together with plastic tape. I was disppointed with this surprise and send a complaint to the seller. They offered to return the book and get refund, but I have no time to order another one, so I accept discount and keep the book.
Another hurdle is the delivery time, I was informed (after paid) that the book will arrive in 6 weeks. I asked for quicker delivery, but they just say sorry. Actually, the book arrived after 10 working days from the ordering.