I've been using eBay to complete my collection of the Bionicle chapter books recently, as I only owned about half of them before now. This mainly consists of me finding lots that are selling 10 or so books, only a few of which I actually want. I buy the whole lot, usually for a low enough price that I'm actually getting a bargain even considering that I'm only going to use fewer than half the books in the lot.
As a result, I'm going to have a lot of duplicate copies of these books by the time I'm done. I've only bought 3 books that are new to me so far, and already have a stack of a dozen duplicates
So... what should I do with them? I don't really have any interest in reselling them myself, so I was going to donate them or give them away somehow, but the more I think about that, I can't see any realistic ways for doing that. A toy store or something wouldn't want them, as their main purpose is to promote toys that are no longer being sold. If I gave them to some kid, they would probably enjoy them, but then be disappointed when they found out they couldn't buy the characters the in the book.