Where in Aus are you located? Tailwheel can be done cheaply here if you know where to look. I just did my tailwheel endorsement for about a grand including two days of accommodation in NSW. Did it in an RA aircraft but the endorsement will be recognised by CASA too. Granted it was only that cheap because I managed to get signed off in 3.9 hours, may take longer depending on how quickly you get the hang of it. I know the US is cheap but for such a quick endorsement I wouldn't make the trip, might be worth it for seaplane I guess.