Thats a bit of a general question considering the multiples of coins released each year in bullion and proof, coloured and gemed and so on. anything more specific you are asking about? Are you buying of selling? Gold, silver platinum etc.

Good point. Let's say silver kookas, is there a year by year price and Mintage guide for them? I'm thinking of something like beckett has for basket ball cards

Of course, Renniks lists all the proofs and privies prices + mintages for kooks (along with a multitude of other Australian coins). For bullion kooks you'll probably get the best (most realistic) prices by browsing this site. E.g., https://www.booktopia.com.au/rennik...edition-michael-t-pitt/prod9780987105769.html

With all due respect the price or value of our coins are only worth what anyone will pay for them! The one thing I have noticed is the remaining Kookaburra coins I require are either not available or on the other hand so expensive I cannot afford them .