Ohhh! I’ve played with these before and they are tons of fun! Amazon has the Gamma Green Hulk Smash Fists for only $11.99 (down from $29.99)!
These have a four and a half out of five star customer rating and are eligible for free Super Saver Shipping with an order over $25. They will also arrive by Christmas with Super Saver Shipping if you order today (12/18) or get them in two days with an Amazon Prime membership or trial.
(Thanks The Frugal Gal!)