Live beneficial bugs
You thought it was going to be some gag gift? Nope. The weirdest product that I've seen on Amazon so far is thousands of live bugs that just so happen to be surprisingly affordable. Whether you're a farmer or you've got a pest problem, now you know where you can go if you find yourself in the "live bug" market.
If you click on the "1500 live ladybugs" link below, you'll find a list of suggestions for what you could do with 1,500 live ladybugs. Children's birthday party is one of the things on that list. I'm not kidding.