Candystore and Supreme are good but both on vacation right now. I've had good ket from UPS, bit pricey @ $120/g though. Heard good things about MyDrugsAU and Apexsupplies, those are 3 I'd look at in absence of the two I mentioned at the start.
Very happy with my first K purchse from /u/ObsidianBoutique - crazy fast delivery for this time of year, overweight and good gear. /u/dirtshark is solid, but out of K at the moment. /u/ups has great k too, just a bit pricey.
I ended up going /u/ObsidianBoutique and both were fucking amazing. 10/10 recommend. One review nearly put me off the MDMA but I am glad I went with them. For $99 for each is a fucking steal given the quality.