I voted that my LDS has Nitrox, to my local dive shop is 1100 miles from here. They us a molecular sive set up with a haskel. The vast majority of fills is now Nitrox, and they service four boats from the dock at the shop, 50 spots between the two big boats, 12 more on the other two. 2 tanks per make 124 per night, after 4PM before the 7AM departure. I think the handle a lot of other traffic but I don't know the volume. The spots are 100% full every weekend and about 70% during the week. I make that to be about 700 a week.
The best part is that since there is never 100% O2 it's relatively safe, or at least safer than PP mixing.