Book swap?

I find myself with a small box worth of paperbacks that I know my local used bookstore won't buy back from me since they're trying to reduce inventory. I know if I give them to most places they'll just end up in the trash. Anyone else (in the continental US) have some books they'd like to swap for these?

Make no mistake, these are on the low end of the literary scale -- mysteries, romances, fantasy, YA, with maybe a biography or history thrown in. I'm looking for similar light reads.

I figure if I send them media mail they'll be fairly cheap to mail. Much cheaper overall than even browsing at the used bookstore. ;)