Two 4-die manual penny machines in the SPAM Museum Gift Shop.
After going through the museum and into the gift shop, Machine 1 is on the left side, against the wall. If instead you go straight to the gift shop from the museum entrance, the machine will be on the right. Unknown the exact location of machine 2 in the gift shop.
2/25/17: "Machine 1" has been officially retired (according to the employees on staff in the gift shop). "Machine 2" is now their only machine. It is just inside the street entrance doors to the gift shop.
Commentsthegillion added SPAM Museum to system.