Viola & Xander's Ma: Thanks for your anecdotes.
Sadly, I think I'm abandoning ship.

My midwife(s) were trying to be open, but they really aren't comfortable with it. They say its only used in hospitals in Europe, and they're not interested in being pioneers. I thought it WAS used in homebirths in Europe, but I just don't have the energy to keep researching at this point.
I did get some more information from the local Air Gas dude though:
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The nitrous oxide is part number NS USPE and they cost $38.00 to fill and also $4.50 monthly rent. The oxygen part number is OX USPEA and it costs $18.50 to fill and monthly rent of $4.50 each cylinder. (I think these are for "E" size cylinders, whatever those are.)
$20.00 delivery charge and a fuel surcharge of $12.60 per delivery. The fuel surcharges go up and down based on the price of diesel fuel.Otherwise, all they need is a state license number to deliver to the Birth Center.But you still need a mixer or "flowmeter". Airgas offers two, one has manual flow controls and you set the flow for each gas. The second unit automatically mixes the gases for the proper flow. They are $3,500 & $3,800 (respectively?). They include disposable masks that "evacuates residual gas that's not inhaled". Also they include a "scavenger flowmeter". I don't know if that means it prevents exposure of other people around mama to the Nitrous or what.
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Expensive, as anticipated. But I was also told that there are smaller units designed for ambulances that are probably cheaper. No info on them though.
If anyone wants more info on the flowmeter/mixer things w/o dealing w/ Air Gas, PM me and I can send a pdf flyer.
While I'm giving up, I encourage y'all not to. I have found no evidence that having N2O at a home birth is illegal or impossible. Just not possible in my situation. The more we try the sooner this option will be available to all our laboring sisters.
As far as I can tell all you need to get it in the US is: a willing, licensed professional (that can prescribe drugs), and a little cash on hand (unless your willing professional is a dentist) for the two tanks of gas, a mixer, and probably a pulse oximeter. Then there is still the concern about exhaled nitrous. It sounds like hospitals have a method for "scavenging" it. It isn't clear to me how important that is.
3cuties good luck!!!
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