We do this at a used book store. It's books that we don't think we can sell inside for whatever reason, and we put them on shelves outside. There's a big awning so they don't really get rained on unless it's raining sideways. We sell them for a dime or a quarter, and there's a slot for overnight drops in case people want to get books at night. Every morning there's at least a couple of bucks from the previous day/night.

We donate the proceeds to public radio, and over the years we've donated over $100,000.