They do turn up from time to time. Stick it in your saved searches and wait. There are schematics around the web for building them yourself if you search a bit.

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Would you happen to have any links to the schematics?

Thanks

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Did you happen to see my post above with a link to one that's on sale? Are you outside of the US? (I couldn't tell since there's no mention of your geographical location in your profile.)