This is my favorite book store above all others even new book sellers. Admittedly I buy most of my reading material digitally now but I still like a paper book now and then. Their kids section is absolutely wonderful, we have found all of my daughter's favorites here. She picks things that I never would have expected & books that I would have thought to be too advanced for her to really like.
They usually have multiple copies of all of the most recently published, popular reads as well as things that I missed when they first hit the new book stores. (I go less often now in favor of Amazon and Kindel so I miss more than I used to).
I've noticed that most new book sellers have fazed out the chairs & couches. Other places seem to discourage lounging and browsing the inventory now, a real shame. Not at Half Price Books. This place still has several seating areas for customers (I wish there were a few more, sometimes they are all full).
For the same price as what I spend at Barns & Noble for one or two titles I can get a pile of good quality books. I don't sell, I just buy. I can't comment on what they will pay you to take used items off your hands but I will tell you that if you are purchasing items the prices are unbeatable. Great value, great place, highly recommend.