And while there are many of them readily available on the website, hardcore collectors are always on the lookout for the rarest Funko Pop figures, the ones that were released as part of exclusive events or limited releases. The Red Metallic Stan Lee is one of the rarest Funko figures in the world, with only twelve of them existing in the world. The Batman 2010 SDCC Exclusive Funko Pop! The Dumbo (Clown) 2013 SDCC Exclusive Funko Pop! To sum up, there are many things out there that you can collect, but the most valuable ones will always be those that are rarest.