Thats really sad they rook you in to paying an extra 40 dollars. I cant beleive they contracted the exclusive rights that anyone sailing with them has to pay the mark up.
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Price if booked direct with Stuart Cover, (2 tank dive includes tanks/weights)
from http://www.winnipesaukee.com/photopost/data/512/214insurance5.JPG?796
If booked in advance -------- $ 95
booked on the island ---------$105