Hi AspergianAbroad! Welcome to Wrong Planet! Check out the different forums and articles here. They are interesting and helpful. The Autism/Asperger's forum has articles with links to online tests.
I am sure there are quacks who would be willing to diagnose you online for a fee, but if you want an official diagnosis, you will actually have to go and see a psych doctor. You should only pick one with some experience with Autism/Asperger's Syndrome spectrum disorders. Perhaps after locating one in Arizona, you could arrange a doctor visit during a trip home, but you should try to schedule an appointment well in advance of the trip, as psych docs tend to be pretty busy.
One thing though, is that unless you need to qualify for government or insurance help with your disorder, you really don't need an official diagnosis. Many of us just research our condition, and take the online tests to privately confirm or disprove whether we are on the spectrum or not. Some however, do want official confirmation, even if they are not applying for any kind of assistance with it.
I hope you find your research on this site helpful. And remember, you are among friends here at WP!
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau