Find out which acupuncturists your doctors use.
Make sure they went to a four year acupuncture school. Many chiropractors, for example, can get certified to do acupuncture in a couple of weekends. Other than that, it's kind of word of mouth. Good small health food stores used to keep files of practitioners their customers liked, but I doubt there are many of those left what with Whole Foods and its imitators having taken over the market.