Great eye, Pescador12!
I wonder if Amazon had a batch of them to start selling during the holiday season and ran out almost immediately--and the "1 to 2 months" means "don't expect it before Christmas".
https://www.amazon.com/Segway-miniPL.../dp/B074VLZPDZ
Best Buy is also selling the miniPLUS now, or at least it seems that they may have been selling it before it "sold out". $729.99 including the current discount. And they list more specs--although I have not verified those specs' accuracy.
https://www.bestbuy.com/site/segway-...hite/6115202.p
Chris