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USA Airbrush Supply has good prices for Stynylrez primer, but shipping costs are high.

Spray Gunner has good prices, but I'm also looking for gold.

I'd like to get 4oz of black, 2oz of gold, and maybe blue, yellow, and other colors.

If you know a seller of inexpensive primer that I can brush-on, I'd appreciate it!

I assume your in the US?
If so, I can't help you with finding a supplier, BUT I want to point out that Ammo OneShot Primer and Ultimate Primer are the same products basically.
It's widely assumed that the factory that makes the primer sells it to other regions rebottled into those two, cause the text on the packaging and how it's sealed and behaves is too close to be a coincidence, plus all 3 say made in us.
So if you find those cheaper, then you can get those.

Amazon carries the main color sets. Miniature Market has the metallic for a good price and shipping.