The cost of making one it probably several thousand dollars, not counting the year and a half of Bunnie's time.
From then on it depends on how many you want, and if you can find an assembly house that will take a tiny order for (say) 1000 of them. Even in large runs I can't see it costing less than $1000, partly due to the FPGA on the board. Handcrafted aluminium and leather cases are also likely make up several hundred dollars of the price. That case looks particularly resistant to mass-production.