Snake hook--midwest tongs. I have the collapsible one. It's perfect for hiking and home use. It fits in a back pack perfectly.
Thermostat- hrm. I think it's made by Aline. A good friend of mine recommended it to me. Works beautifully.
Heat domes- Fluker's. They're bases in Louisiana, so I'm partial to them. :-P
Heat emitters- I use Pearlco. Bought them on Ebay.
I personally think certain ZooMed products are crap, like their UTHs.