I can't believe it but I own a Castor now!!
There is a guy on ebay selling them for $240 apiece, I was a bit nervous but it came intact. No holes punched in the card and mine still has the pull tab in it. He's accepting offers, worth a shot if you are still looking for a Castor. I couldn't see paying $1000+ for one but $200+ isn't really too bad imo.