BookMooch Bookmarks (USA: CA) (2013/09/12): These are bookmarks printed with the mooch aliens on front, and a little info about BookMooch on the back.
Ideal for keeping your place in a book, and also for giving to friends when you tell them about the joys of mooching.
I'm sending these to anyone who wants them. The idea behind sending a box of 500 is that you should include a few in each book you send out, thereby spreading mooch-love to each person you're sending a book to.