The best food I could find at an affordable price and readily available is Canidae grain free for all life stages (ALS). You can get it from independant pet stores. I've heard you can get Innova from pet's paradise which is also supposed to be a good food. I wanted to feed ZiwiPeak but there are only a couple of stockists in Australia with irregular supply due to quarintine issues and it's $115 for 2kg's! I have 2 Chis (granted they don't eat much) so that would only last me a month. I'm about to start them on raw thanks to all of the excellent info and advice on this forum so that will be much cheaper, just a bit of work once every few weeks with a calculator, some scales and a whole lot of freezer bags.
Even in summer it can be cold on morning walks in Melbourne, my little man complains so it would be nice to have more clothing options available. He's only 4 1/2 months so I also struggle to find anything that fits him, he's getting by with one shirt at the moment as it's just for walks on cooler days.