It's back, with a mild price reduction:
http://cgi.ebay.com/ws/eBayISAPI.dll...:WNARL:US:1123
I enlarged one of the photos, and it kinda looks like the plastic insulator
around the CRT is full of cracks. A replacement might be tough to find?
I'm not sure what causes these to become hard & brittle, but my best
guess would be excessive exposure to sunlight. Most of them remain
soft & pliable.