lucy24 - 10:57 pm on Feb 26, 2013 (gmt 0)
What's the online equivalent of a classified ad in a trade publication? That's where I would look. That is: not sites focused on selling, but sites whose users know-- and might want to buy --the product.
Assuming, ahem, that you acquired the products through ordinary channels and they didn't fall off a truck, you may already know some of the sites. (Don't look at me: I have no idea what a plasma cutter is, nor even that there exists a form of plasma that can be cut. Or, uhm, that can do the cutting.)
:: wandering off in search of enlightenment ::