Does anyone know of a good online used book store? One that has a good selection of recent and older books in a variety of genres (though I'm most interested in mystery/detective and scifi). Also, it would be nice if they didn't rip you off on shipping. I'm experiencing the situation where after they add shipping you might as well buy new. I've tried some book search engines, but when you're trying to find several books, no engine I've tried helps to find the one store with the books you want. Buy 5 books from 5 different stores and shipping goes up. BTW, I'm mostly looking for pocket books to read and not collect. One store I like (though they don't have what I'm looking for now) is www.1stchoiceusedbooks.com.