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> Helium costs about 20 cents per cubic foot, and oxygen 10 cents, so if
>the shops took that plus the air fill, they come out to a price that is
>about 20-40 dollars more than the same air dive . For 20 dollors or even
>40 more dollars for complex dives, the insurance of this last correct
>"tool" to get the job done smoothly is well worth it,

Interesting.
I was pricing helium lately, and the local distributors were fairly vague
about grades, and said for human consumption a super,super clean grade was
needed, at a tad over $100 a tank for a 260-300 cf tank, which is about 4
or 5 times the cost of O2. What grade are you using?
BTW, the only shop I know around here which has been doing tri-mix is
getting $90-100 for a tankful.



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