Montezuma's now offer up their version, called Zwickies, which I bought just yesterday. The first two pieces were disappointing; all snap and crackle, but no pop. But the third piece was incredibly satisfying. Plenty of fizzing, popping candy for your buck.
One could probably make some based off Chubby Hubby's take on Heston Blumenthal's Popping Candy cake. I knew I should have spent my last ten Norwegian Kroners on a bag of popping candy when I was there a couple of weeks back!