Bonus points if those stations are all functional and online.

$500 to blow on eBay would be awesome. Not sure what I'd use it on first though--something Mac-related that would just take up space, a bunch of classroom supplies I probably don't really need, or some non-functional 1985 Honda Accord that I'd pledge to restore but would never find time to since I'd need to take a lot of classes in auto technology (I can drive it and put gas in it, that's about it, but I'm sure I could figure out all the other stuff if I had more time and an actual garage/tools).