I noticed that, even here, in Washington State, Lowes and HD are out of generators, having been shipped to stores nearer LA and MS. Doesn't sound like the shelves will be replenished anytime soon.
I am just about to order a tri-fuel conversion kit for my Generacs (gasoline, LP, and natural gas). Maximum fuel flexibility is really important. Would make me even happier if these particular generators would accept diesel, but of course that is physically impossible.
If I had a place to put it I would be purchasing an old-fashioned Lister diesel motor and head. At 600-800 RPM they'll run for years on end without significant mechanical wear.
I'm still using a Generac my dad bought in 1979 after Fredric. Runs great. I just ran it for five days straight after Katrina. (starting to use a little oil though.)
YamahaGenerators.com claims they have multiple models in stock ready to ship today.