Great used bookstore. I probably frequent this place way too often, and almost always get something.
Don't let the website mislead you into thinking it's only rare books. There's something for everyone. Paperbacks are mostly under $4 or $5, and I don't recall ever seeing any above $8 or so, unless it's a special edition (e.g. Advance Reading Copy). Also, huge plus: they finally organized the paperback sci-fi section, alphabetically by author. You can now find the good stuff without having to dig through endless rows of weird crap. Yessss!
I've also gotten some nice hardbacks, like a couple of beautiful illustrated Steinbeck novels in cardboard dust-jackets. They were relatively inexpensive ($10-$15). Not rare editions, but they don't make books like that anymore, and that's still even cheaper than new paperbacks nowadays. I always see lots of nice hardcover sets like this. They'd make great gifts.
If something is signed but not rare, it's probably $30-$50. They tend to keep these among all the normal books, so try some shelf-digging and you might find something cool if you're into signed books.
The rarer books are in the glass case by the register. These are nice to stare at while you pay for your cheapo books :)