About 200-250 for the parts if you build it yourself. Will look to add it to nostr:npub1yy0nyk6nj6tg4sx8nd7q5qcdw6pqd5e2cc0e8u2rmcgjhpvm63hsk67xe5 when I’m happy with the models. I suspect LNBits Shop and others will sell it too (as all open source).