Went into a kind of unpopular Walmart yesterday (in the US). Every system was sold out. Not even the Switch Lite is in stock. That is how it looked at the Best Buy I was in a week or so ago. No Switch, Playstation or XBox availlable. Also, you can buy these systems online, but they are all well above the MSRP.
Going into Black Friday all of the hardware looks to be cleaned out. I expect that whatever stock is put out during Black Friday will sell out fast.
The Switch and Xbox Series S are available on walmart site and other online retailers.