Have used AbeBooks for years
Have used AbeBooks for years. As a homeschool family, we have to purchase books every year for our co-op classes. The books are very specific, so I find this website a great option. I'm not concerned about the books being in pristine condition, because we are going to USE them. Which means no fretting about if my kids are keeping the corners straight or the leaving them lying open. The only thing I don't like is that they often put very sticky stickers on the cover, which are unsightly, difficult to remove, and leave sticky residue. Sometimes shipping makes the books more expensive than other sites. So just compare.