You can contact ARL and ask if they have any practitioners in your area. Depending on your location, you might be able to purchase a test through them directly. Regarding ARL and TEI: ARL is the lab started by Paul Eck, and TEI is the lab started by David Watts, who studied with Eck. People have done experiments where they send identical hair samples to both labs, and the results were nearly identical. Since they don't wash the hair samples, ARL and TEI are known to be the most reliable when measuring hair mineral levels. However, I've heard that for toxic metals, Doctor's Data is the most accurate.