The best test (and the one I'm really happy with) is on the Dr. Mercola website.
It costs about $75.00 and takes an hour. Included is a membership in the private mt forum led by a naturopath on Dr. M's staff who has been on MT for 4 years.
the computerized test is a result of cooperation between Dr. Mercola and Wolcott.
Wolcott's original test cost several hundred dollars and about 1,000 if you included the consultations (which we get in our forum).
I never implemented MT correctly until being a part of the forum. There are so many things I overlooked like using mustard, vinegar etc.