we used Barefoot off of St. Vincent for ASA Certification. We paid 150.00 a day for an instructor and "challenged the standards". We had our own boat (chartered from Moorings) so we just split the cost of instructor between the four (4) of us and started our charter with the instructor for 2 days, passed test and we were off. Dropped instructor off at Bequia where she lived and we were free and clear. Was a nice way to do it.