Color testing is where I am at right now as well and I am not having to much luck. Thought I had found a local optometrist who did the Dvorine and AOC HRR testing (they confirmed it on the phone 3 different times) but when it came down to it they had the Ishihara and Farnsworth D15, which is not accepted by the FAA.
I have never had issues seeing colors, just the Ishihara flip book as many have stated above. I found an AME office in Phoenix that will run a variety of tests for $150 as a "color consult" but my concern is the fact they are still an AME and could risk my chance of taking other tests.