Wish I knew someplace good to buy single-stage paint economically

I use Kirker brand which is sold through distributors like
autobody toolmart. Kirker Paint Sample Color Chips

A lot of people will mix the colors to create their own colors. You can buy the colors in several paint types including single stage urethane and acrylic enamel. I have used the Black Diamond 2 stage and have been very happy. I also have used the Urethane single stage matte black. I have 2 of my paint jobs highlighted on their instagram page. You can preview the instagram first page without signing in and you will see my blue demon in about the center of the page and my 51 GMC is down a bit above a christmas ornament, but also a lot of other peoples paint jobs. https://www.instagram.com/kirker_automotive_finishes/

The only complaint I have about their paint is it seems to be a bit quicker to dry than the tech sheets say so you may want to go with a slower reducer than they say. Maybe the single stage are different but that has been my experience and I talked with one of their reps and he agreed.