Hey hey fellow Aussie. There's such little info on which vendors will ship to us, and I've found some of the well regarded vendors like Nexaph don't post to here which is a shame. I ordered a month ago from Bfflist / Binh and have had good results so far with their tirz. I bought a kit of 10mg vials (so 10 vials x 10mg) for USD100 + postage. You had to reconstitute with bacteriostatic water but that was easy to get from bacteriostaticwateraustralia.com.au and came in a couple days, along with some syringes. Dont be afraid of having to mix the powders with water, I watched a 5 min youtube video and it's easy. Injections are no harder than having to use the 'official' pens, which start at AUD280/month for wegovy (sema).
As for which drug, I used official wegovy for 6 months and had good results. I got up to the max dose of 2.4mg and was costing AUD480/month and then someone told me about this forum and I've saved so much money and learned so much too. So glad I'm here now. I decided to switch to tirz as I know a few friends that have had great results with mounjaro and so far so good (less food noise and appetite suppression is slightly superior to sema so far).
The hardest part is finding a vendor that you trust, that ships to Australia and that won't take your money and run. The supplier I used so far took credit card through Alibaba, which was great as I didn't have to send crypto. I'm ok navigating crypto exchanges etc but it's easier for them to do a runner, I feel. The bfflist.org site is down at the minute so I sent them an email to ask whats going on and they said the influx of so many people from TikTok etc has made it risky for them so they are going to wait and see. Hopefully in a month or so I can place another order as I want to get some other peptides now that I've learned about.
Good luck! Let me know if you have any other questions.