At my local library, they sell used books, both paperbacks and hardcover. They have maybe 200-300 books $1-$2 for hardcover normally $.50 for paperback. You obviously can't go in expecting to get a specific title, but I'll go in there and for $3-$5 total walk out with a bag full of books. I've already found some good stuff there, Dean Koontz, Stephen King, Robert Ludlum, Arthur C. Clarke. Don't know if your local library does this, but it might be worth checking out.
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Dazed and confused.... but happy!