The value of the Kenometer is not really in its assembled form, but rather the thermopile unit it's built with. The thermopiles are already calibrated to 1mW to 1mV or something, and just get attached to a power supply and an ADC LCD, with a small zeroing circuit if it's better than a Lite variety. It's not really going to drop the price much for an unassembled version, unless you're talking about the difference between the Pro and Regular models. If he's selling these power meters, assembled or not, he should be keeping them at (at least) the $300 or so mark because you're getting a Coherent thermopile built into the meter, which--alone--usually costs at least $300 on eBay.
I was lucky enough to get in on the Kenometer Lite deal at an insanely low price of $150, and requested an unassembled one because I'll be using it for parts, not as is. I haven't received the parts yet, but I don't need it right away and others should get theirs first.
