Well im guessing there would be about 30 bikes in Au, but very few frames only. IF you want to buy a frame your better off deciding what motor your going to run as you not going to mod a frame for a motor, its just not the done thing, nor would you have much hope of getting it renickeled properly over here after a frame mod, for less than your arm or leg
If you want to run a 2 stroke pick two motors, if you want to run a four stroke pick two motors, and then i can give you the frame numbers you want to look up, ebay etc. you
need only chace the frame you want then and can be specif it will be easier to find them and ask the right people who have them. IF you dont have a motor in mind why do you have to have a trackmaster there are plenty of other frames out there champion, boss, redline, c&j, etc, is this a track bike you want or an MX ? cause then you want to be looking for a cheney, metisse or whatever and again your better of picking a motor and then we can chance one up for you,.
can i ask what you think you would be paying for one ?