Vanbar in Melbourne (http://www.vanbar.com.au/main.html) and in Sydney have the ingredients, but you would need to phone them first to ensure that all the chemicals are in stock. Their web site is a bit of a mess, and the old address of the catalogue might be better:

http://203.57.152.243/shopping/index.php3

They have a number of kits for developers, but not PMK. They might make up exact quantities for you to facilitate mixing if you don't have a weighing scale with you. Ask for Mario at the South Yarra store (Wednesdays and Fridays, I think) on +61 3 98.27.08.77

If all else fails, and you are in melbourne, you could weigh the chemicals and mix them at my place. In other cities, you could probably find APUGers that would do likewise.