I'm considering now if I want to try to crank out a batch of these. I'm going to shoot off a request for a quote from the assembly house and gen up a parts list and see what the numbers look like. Since it appears it should work most anywhere, it's more likely to be cost effective to produce them and sell at a decent price. It would be a nice bonus that it all fits in a 9V battery space, the alternatives are larger and take more space. This one also works well for conventional running at much lower voltages, the benefit of the double conversion power supply. If they couldn't be less than $40, I probably wouldn't do them as that's probably the threshold of pain for many folks. 
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