Where to buy small pots of paint

Hi. We have some furniture that needs painting. The design requires quite a few colours - which have been chosen from Nippon and Dulux colour swatches. I only need a very small amount of each colour, say 20 ml - some in gloss and some in satin. Getting each colour mixed up into the smallest size of paint can at Bunnings is about $22 each, which adds up to way too much when all are considered. Does anyone know where I can buy small cans of paint that can be tinted. I thought about the sample pots put out by Dulux etc as these would be ideal but the only ones available seem to be flat paint.

any suggestions.

thanks
Arron