As far as i know he was the only one selling them. someone else made them so there must be someone out there selling them, you may try to get on the UK forum and see if anyone there knows where else they can be bought.
I think the forum name is RCTankWarfare but i cant remember , been a while since i was here. I believe Ex-Pat-Tanker visits there maybe he can fill in the blanks for us.
Did you contact Forge Bear directly from his Ebay Shop. Should be able to contact seller through Ebay.