I just saw that the termoworks web site now has the key chain thermapens for $15. Not sure how well they'll work, but they look cool so ordered one for me and one for my teammate. Just thought I'd share as I remember there being some interest by others in these a few months back.
Keith Fat Maxine's BBQ
Thanks to: Mojobricks, Make It Meaty, and In House Jewelers
Humphrey's Battle Box
GMG Davy Crockett