Free used books

• PaperBackSwap.com, TitleTrader. List the books that you'd like to get rid of, then wait for someone to request one, which can take as little as eight minutes. Mail your book to the person and you'll receive a credit to choose your own book. PaperBackSwap.com involves only paperbacks, which keeps shipping cheap, usually about $1.60 per book. TitleTrader also lists DVDs, CDs, and VHS cassettes and can rack up higher costs with heavy hardbacks, though shipping rarely tops $4 at the book rate.

What's the Catch? Popular fiction moves fast, while classic and esoteric titles may stay put for months.

Find Out More: www.paperbackswap.com, www.titletrader.com.