The first year, I charged for parts, which came to $50 per controller. So I ended up dropping about $7500 up front and recouped that as people paid in.
This year, I'm paying someone else to make them, so we're at $125 or $150 (running promotions from time to time).
If you want to chat, I'm more than happy to share how I did it, and share code/board schematics, etc.
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