Just was directed to your topic here and it was of interest to me.

South East Queenslander here.

I take a 1mg cyanocobalamine sublingual which I purchase from a health food store. I'm very happy with that, but I was just chatting with the naturapath there yesterday and asked her about the availability of the methyl just because I was curious. She looked at me as if I had rocks in my head. lol. Suggested I look into Sports supplements. OK, so I did and there's apparently a shop in Everton Park, Brisbane that sells it.