Hi Howard:
I was able to get a 2-ounce bottle of PPG toner, mixed to the color I wanted, at an auto body supply store in San Leandro. It was $20 for this tiny bottle, but better than $150 for a quart. I expect specialty auto body repair suppliers in your neck of the woods should be able to get it. You might also contact San Leandro Color, in, oddly enough, San Leandro, CA to ask if they can brew up what you need. Larry Wong lives about a mile from there and mixes all his own colors. He could probably be persuaded to pick it up for you. I live about 5 miles away and could be persuaded, but not as easily as Larry. The 2 oz bottle will mix to make 8 oz of sprayable material, though I will probably only make 4 oz for my small project, pictured.