This is a solid used bookstore. I've been to amazing used bookstores, where they seem to have every book that you could ever ask for, and I've been to horrible used bookstores where the only books you can find are ones that were obviously picked up in bulk from someone's estate sale. Half Price Books has a pretty strong selection. I've come several times, and although they don't always have the book I'm looking for (ex: they were missing Red Mars a few weeks back, but they had the sequels), they always seem to have at least a few books on my Goodreads list. If they don't have a specific book, they're willing to help you look up the nearby competing bookstores and figure out if any of them have it - that's a class act.
Overall, this is my go-to used bookstore for when I need to grab a few fantasy and sci-fi novels for an upcoming vacation.