Please 
Don’t know of one, but I’ll swap with you…
Thanks! But it is actually for my MIL. She doesn’t have one she can drive to locally and I was wondering if there was an online place I could occasionally broker some out for her in bulk. She likes romance novels, so that’s what she’d have to trade.
Personally I’ve never met a book I didn’t want to keep. But maybe that’s just the pack rat in me.
I’ve been on www.Paperbackswap.com for a couple of years now, after seeing it plugged in a thread here on the Dope. (Despite the name, they’re not limited to just paperbacks.)
I’ve been happy with paperbackswap. There are several similar sites, but I have no inside information about them: swaptree, bookmooch, etc.