Hi Gadge. I have found a couple 500g tubs, they aren't as common as the 2.5kg tins though. I found one at a swap meet, one online and 2 at my old Highschool. The company which made the tubs still has pictures of them on their website, even though they likely stopped producing them around 1997.
http://www.plastictooling.com/products.php - I might need to make that a proper link later, my internet isn't the best at the moment, big rains in Brissy.
The late 2.5kg tins are still worth something, so don't throw them out. I don't usually buy them unless they are $5 or under though, easy to find, hard to post
makes for a limited market if you re-sell. But $5-10 is still better than a trip to the dump.
I have recently found a 1 litre Brake Fluid bottle, a stubbie cooler and a credit card wallet all by Ampol.
