Vintage Playmobil
Dollhouse real estate is very real—these miniature homes have a unique market. The Playmobil mass-produced German plastic dollhouses are universally beloved by collectors. This 1995 Victorian Dollhouse is listed for sale at $800, and the knight's castle goes for $649.
Action Comics No. 1
The most expensive comic book ever sold on eBay was this 1938 "Action Comic No. 1" issue. What makes it special? Well, this is the comic that introduced Superman to the world. The issue sold for $3.2 million on eBay. Fewer than 50 copies currently exist.