Once every two years I pretty much clean and sort out what books we need and what we don't need. Either we donate most of the books or give it away. It's a hassle for because we have to drive far to the donation center drop off. I am glad that I found this cool site online http://www.becksbooks.com where you can check how much they will buy your book. In that way you can sort out the books that worth something and those that does not worth anything. You can also check on what books they have available for sale. It's really helpful and convenient site for me and I will recomend this site to my friends and family.