PGM Playgroung Maniacs.
From what I can tell, they sell them a couple of ways.
1) In a bag with 4 other figurines (Silver Surfer, Wolverine, Sue Storm, & Spider-Man)
2) Individually in a bag with a whole bunch of stickers.
I saw both of them offered at Five Below stores. I found them online but they seemed to sell single random packs of the ones with the stickers.
Look at me being all helpful and junk!