CMH has 10+ lodges, most with 40+ guests, so this is 500ish people in the mountains at anytime. so this needs 1000-1500 pairs of skis, and usually the skis last 3 years or 500 pairs a year are bought (and sold off). Mike Weigele is the 2nd biggest total (biggest single lodged based) and has 300+ pairs, for the 100-120 guests at a time. They are atomic only and widths range from 80-120mm, plus some odds and ends. You can BYOS to them too.
they currently have in stock some atomics (85ish mm krongues, and 100mm heli/sugar daddies, and some test pros that are 107ishmm) from k2 they use coombas, and pontoons (and others) and have dropped volkl explosvie. Also they usually have a few pairs of test skis around for both guests and guides to try, both proto types from the companies they deal with, and from companies that want to deal with them.
you can bring your own skis, but it is usually not suggested, as they get THROWN in and out of the heli basket 10-20 times a day, plus your gear might not be apropriate, and there rentals are free.
what they have is based on years of testing, over a almost 6 month season, for both guests and guides. usually a range of sizes from 150-190 and from 85mm to 130mm. again usually enough to make most guest happy, and ski well with something...