I bought my G11 direct from OPT and by the time freight, GST and import duties get figured into the account I was really no better off than buying it in Australia. Buying addition bits though is a different story. I nearly always get them from OPT.
In Aus, Peter Ward at
http://www.atscope.com.au/ carries Losmandy gear and Matthew from
http://www.telescopes-astronomy.com.au/ carries the mounts. Last I looked Peter was charging around $5000 I'm not sure about Matthew (check with Striker he bought the last one from Matthew when I wanted one
) and I think that was around the same price. Both with Geminii