Re mutiple visa into PRC as a tourist

I am travelling as a tourist from Macau to PRC in October 2013 for six days and then going back to PRC in March 2014 for two weeks. I would like to transit into Macau and also Hong Kong several times and was wondering if I can get a mutiple entry one for six months and if so what would be the full cost from the China Perth Consulate. Please note that I have previously been into China on three other occasions as a tourist only.
Look forward to your reply
Robert Chalmers