I have lugged many heavy books from one place to another throughout my life. Movers charge by weight, so I know that has cost me a pretty penny, but I really valued my books, and so I held onto them. I haven't been able to work for the most part since I moved here about 7 years ago, so I finally decided to part with my professional books. I've already gone the route of carrying them to Half Price Books, and they really don't offer much for them. I decided to look around and see if I could sell them online. I found a site called SellBackYourBook.com, and plugged in some ISBN numbers to see what I would get. As I suspected, they wouldn't even buy back most of what I had, but there were some they were interested in. I packed up a box of books from up here in the office earlier, and they will be picked up tomorrow. Assuming they give me what they quoted, and they should, because those books are in almost pristine condition, I will make about $30. There is no shipping fee. I got excited, so I started going through the books downstairs. I should get back another almost $10 from the few they wanted from that bunch, and so both boxes will be picked up tomorrow. The USPS picks them up for free, so all I have to do is stick them outside my door. The site will pay either via a check or PayPal, and as usual, I opted for PayPal payment. Hopefully soon, I will have $40 or thereabouts from them, and that will really come in handy. There's a companion app to the site, and you can use it to either scan your ISBN numbers (it will give you a link to click to download a scanner app), or you can manually type them in. I used a combination of both methods, since some of the labels were easier to scan than others, and some of the older books didn't have the ISBNs on the back. The site has very high ratings in review sites, and so I feel pretty comfortable dealing with them.