I was in Michaels crafts store today looking for some small plastic bottles I could use to store some non standard colors that I am mixing up and I came across some bottles that are the same size as the 2 0z bottles you get from dixie art and the collar is threaded to fit the blast cap tops from the 2 oz bottles. The bottles were 69 cents.

The nice thing is you can store the paint in the same bottle you are painting from...

cup from 155 anthem fits iwata like a glove

Good find