Scalpers, or people ordering two, then turning around and putting one up on Ebay, which will probably sell to someone desperate enough to pay the inflated asking price.
Nintendo put some requirements on registering interest in the purchase of the Switch 2 — have to be a member of their player’s club, have logged at least 50 hours, and then can put your name in to buy ONE.
Nvidia made the chip and had said that Nintendo had it for years now.
My wild guess is, the rollout is being done well before Christmas, and that production was ramped as soon as all the rigorous testing of the hardware and the flagship game went flawlessly.
I’m sure an appropriate number of tens of millions of units will be ready to satisfy demand.
The original Switch rollout was eight years ago, and included the boss of the company smiling as Jimmy Fallon played games on it during the Tonight Show. Nintendo knows what it’s doing. :^)