No, I don't think so (anymore).
Bintel used to sell the Johnsonian platforms, but I don't think they do anymore.
Matthew Lovell from Telescopes-Astronomy in South Australia has been talking about manufacturing some EQ platforms for sale in Australia, but I'm not sure if it has got any legs yet. I know Fahim (netwolf) has done a lot of research into it and had discussions with Matthew.
I used to own an EQ platform, and imported it directly from
www.roundtableplatforms.com . Brian is a great guy to deal with and a number of other aussies have also bought from him.