This was the first time I'd ever been to Half Price Books which I recently learned is a chain. I really liked the layout of the store, and the sales people were very helpful. The prices are great, about on par with Amazon, but the negative is that it's hard to search for anything too specific, because books are in very broad categories.
I found all kinds of good books here and also sold books that Bookman's wouldn't take. I like that you get cash for them, straight up, no messing around with store credit slips I'd likely lose.
Things are very organized and laid back.