EDIT 25/01: If you live near Carlingford NSW, CCPU Computers is also listing the Ryzen 5 3600 TRAY for cheaper at $280 pick-up. They offer shipping as well, but require extra email communication.
Tray version, i.e. still legitimate stock but it is only the CPU, and no retailer packaging box nor fan included. It's very common in many countries in Asia. Thanks to the ACL, there's effectively no difference with regards to the warranty the retailer needs to provide for the CPU.
Now, tbh it isn't a great price, and likely a niche listing for people that are desperate for a 3600 and want the best price. Cheapest retail box with cooler is $30 more . However, if you don't mind waiting until Feb, getting it from Amazon US as in this post (the deal appears expired, but the Amazon listing is still valid, at here: https://www.amazon.com.au/dp/B07STGGQ18?smid=A4XRJ8S0WXSO0) is the current cheapest at $287.27 delivered if you have Amazon Prime (at time of writing this post).
Free pick up at its Sydney store-front, or $8.16 shipping for the post codes I tested (20xx, 30xx, 40xx, 60xx).
Or if you prefer the Australian stock of the retail box packaging with the cooler, then so far it's cheaper here at $305.10 delivered from Computer Alliance (see this post).
EDIT: Price reverted and new end date is end of 17th Jan 2021
EDIT 22/01 AM: Back to "In Stock" availability.
EDIT 25/01 PM: Deal extended for another week.
EDIT 01/02 AM: Deal extended for another week.
cpu on trays is still a thing?
back in the days of computer fairs, you can go through the tray cpu and pick out the best overclockers (usually identified via their production/batch code posted by others on the internet)