These furry little cuties fetch a surprisingly high sum for a line of toys that has only been on the scene since 2005. The unique thing about Webkinz is that they have an online counterpart, which allows you to play with your pet on the Webkinz website. It works by typing in the secret code on your plush animal's tag. Suddenly, you're connected to the online version of it. Pretty cool for the early 2000s!
If you're the owner of any of the following Webkinz, you could make a bunch of money. Cheeky Dog ($600), Cheeky Cat ($200), Love Puppy ($200), Sherbert Bunny ($100), Pegasus ($100). The key is that the type of Webkinz you have has to be discontinued for it to be worth a lot of money. If it's not discontinued, it is probably only worth $30 at most.