I'd say at $150 you'd need more like 100 kits with the initial build...

It's not quite that simple. The costs to me of a batch of 25 will be several thousand dollars, and my cash flow is not unlimited. I will, at first, have to produce fairly small batches.

The PCBs, which are the most time-consuming part to get made, will probably be done in 100-off quantities to keep the price down to reasonable levels, after the prototype run.

Patrick
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Experience is what you get just after it would have helped...