For what I know,Half Price Books is a fairly large chain where I live. I just looked on it online, and it turns out it is only in the West, so it would be a shame if there was not one near you.
Basically, it is a discount book store, which as it's name suggest, sells books for about half the price of it's competitors. Most of the books are used copies since you can sell as well as buy items there. Along with books, they sell movies, comic books, novelty items, records, manga, and anime.
I wanted to bring it up, because I have purchased much of my manga and anime collection from that one store. I believe it is a very good place to buy cheap manga and anime and I was hoping that I could recommend that you check it out if you happen to live by one, but I see now that might not be the case.