Australia is very much more expensive than the USA with the current exchange rate - I'd go there for a Super D at USD230 per hour. Get a tailwheel endorsement in something cheaper like a 7ECA at USD145 per hour. Almost convinced myself to visit the USA for my regular flying fix.
A Citabria at Camden or one of those options at Tyabb will probably be the cheapest tailwheel trainer for a licence - cheaper places for an RAA tailwheel ticket.
Moorabbin is an expensive place to base an aeroplane and the Decathlon is not the cheapest tailwheel aeroplane to operate but, in my opinion, the best tailwheel instructor is David Prossor at Melbourne Flight Training.