6-8 month waiting list here.
More or less the new norm; Generac is buried & their stock has doubled in the last couple of years.
$7500 for a 16KW, NG system installed.
If you can handle having enough gasoline or propane available, then a $1,000, 8-10KW gen plus around $700 for a switch & external plug installation will work for most moderate size house needs.
Not "automatic" & you have to do the switching/plugging in when needed, but works fine.
MM