Wow, that's incredibly expensive! I pay $40 for a 10 tank card in Hawaii, which is usually more expensive than Bonaire for all things diving.
The Dive Friends tank card works out to be $11.66 per tank, including tank rental and nitrox. IMHO that's hardly "incredibly expensive", on Bonaire or anywhere else in the world.
I know that on Maui nitrox is $12 to $15 per tank in addition to $40 to $50 for a 10 tank air fill card, depending on which shop you go with. Some also charge an additional $7/day tank rental fee on top of the fill. Even without the rental fee the low end of the nitrox rental range works out to about $16/tank.
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