I'd been looking at the Hotronics on Ebay, but I hadn't thought about looking on Craigslist -thanks for the link and the idea. I'll have to do a Search there.
One of the questions I had was about the need to cut the Hotronics to size, and how difficult that is. Also, I suppose you'd want to have extensions for the cords so you could carry the battery packs in a pocket at the top of your waders, at least above waistline.
I've tried chemcial warmers in the past but havn't been overly impressed - maybe since some of my winter fishing is in sub-zero weather, and I tend to stay outside most or all of the day.
John