Comment by evilduck

The used ones aren't that expensive on eBay, especially if you just want a functional one and not a pristine show piece. There's a few 3D print models available for them too, and honestly they are rudimentary technology, you could probably make one with hand tools and patience.

I bought a newly manufactured one from ThinkGeek several years ago, some geek-catering company will pop up and supply pent up demand eventually. Curiosity Box fills that niche right now.