Ist collegebooksdirect.com sicher?

I sold books to this site and they robbed me blind. I was quoted for more than a hundred dollars and they paid me less than twenty five. They get you by offering a few dollars more than reputable sites (like amazon) and then cutting your payout once you can't get your books back. After talking with customer service they made up some excuse and cited some obscure line in the agreement that said they were allowed to do it. There's nothing I can do to get my money or my books. I will never do business with this site again and I will do everything in my power to make sure no one else does either- it's nothing but lies and thievery.