Building a cheapino. Since I had to order pcbs, I will build 5. How much would you put it up to sale for?

I am new to ergonomic and programmable keyboards, but something felt fun about making it as cheap as possible by doing 5 at once, and cheapinos at that. I spent quite a few hours on slimming down the cost and ended up spending roughly 35-40 bucks per board, switches and keycaps included. For this I have:...