Comment by tday1
A website that provides transparency into the new/used car market in Australia: https://carvalue.app/
The goal is to allow anyone to know how much any car is worth at a given age/mileage, and eventually help people make better purchasing decisions.
Be warned: It's still a very buggy prototype at this stage and the data confidence for all but the most popular models is low!
I use CarGurus in the US to find used cars since you can very effectively filter on features and lifespan (age/mileage). Worth thinking about - used-car buyers might be after a specific year-range/model or only after a body type and set of features.