With the books, you may want to see if there is a used bookstore in your area where you can get trading credit. Not quite straight cash, but it will let you pick out new books if you can't go to the library.
Not sure about the DVDs and CDs. Those are going to be hard to sell and it will probably take a lot of effort to even get a small amount of cash for them if you do it at a garage sale or craigslist.
"If I had a world of my own, everything would be nonsense. Nothing would be what it is because everything would be what it isn't. And contrary-wise; what it is it wouldn't be, and what it wouldn't be, it would. You see?" - Alice from Alice in Wonderland