https://www.reddit.com/r/VXJunkies/ is fun, but can be a bit hard to follow if you're not well versed in the field.
That was the last I saw on the public market. I think it's just a matter of the carriage insurance - it's just not worth it.
I've heard you can fake one up with a modified Verona cavity and a good capacitor, though. Have you tried that route?
Then I clicked on the subreddit linked from that HN story. I saw a submission in there by a guy I sub to on Youtube... referencing a reply to a video he made that I watched like two days ago.
The hell? How does the Internet work?
Edit: Check out the wikia to get started (http://vxmodules.wikia.com/wiki/Getting_Started) Be careful though, the first time you ever calibrate a wide-angle spectrograph, you'll be hooked!