John,
The plastic measuring cups that fishing rod builders use would work great. They are 1 oz. size and you can buy 100 of them for less than $3.
They look like this:
This tackle company has them for $2.10 for 100, although shipping runs a bit high at $6 for orders under $25.
http://www.shofftackle.com/flexcoat.html
You may be able to buy them locally at a rod supply place if you have one nearby.
Otherwise you could just order 300 of them and save on shipping.
I am going to buy some myself as they work great and they are flexible so you can squeeze the top of the cup to form a smaller spout when pouring into your airbrush. I use eye droppers from the drug store to take paint out of the bottles and into the mixing cup.
Mike
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon