I guess if you're looking for a specific place, I'd say some of the best places in the world to get diagnosed are University of Washington Autism Center (in Washington State) or Tony Attwood's Minds and Hearts clinic in Australia. But, in general, a good place to get diagnosed could be a hospital with a psychologist or psychiatrist (or both if you choose). I hear it's better to hear multiple peoples' opinions, as psychologists and psychiatrists are more familiar with different sides psychology. I've heard that psychologists are more focused on psychological treatments like Cognitive Behavior Therapy whereas psychiatrists are more focused on the neurological side with medicines and such. Or, just in general, it's good to get more than one opinion just to see different viewpoints. Other good places could be a college or university clinic near you if one exists. Some universities research autistic spectrum disorders or treatments, and may be very useful as they could be more centered on autistic spectrum disorders than, say, a hospital. You may even be able to walk into a psychologist's office if they have a private practice to receive an opinion. I'm unsure as to how much it would cost, but I'm sure it wouldn't be all that much. I think it would be good to get pointed into the right direction. If you (or someone else) have Asperger's, you may want to find support groups around you that other aspies go to, or better help yourself or others in ways that you didn't know of before. They too may be able to point you in the right direction. Maybe if you visited a support group they would know where to get diagnosed that's close to you. Anyways, hope this helps.
_________________
I'm 24 years old and live in WA State. I was diagnosed with Asperger's at 9. I received a BS in Psychology in 2011 and I intend to help people with Autistic Spectrum Disorders, either through research, application, or both. On the ?Pursuit of Aspieness?.