When I hear of a new book, CD or DVD I look at the library first. Sometimes you have to put your name on the "holds" or reserve list, but I can always find something there to read while I am waiting. I preview things at the library first to see if I really would use it, before I buy.
If I decide I really want an item, then I purchase it at Half Price Books or Amazon. I also find great things at the library book sales.