I think the surprise here is that WiFi routers were not built with surveillance hardware in mind. At least at first.
If there was an option to buy a router with surveillance sonar vs a router without sonar, I'm sure most people would buy the one without the surveillance hardware. But unfortunately it doesn't seem like anyone has that option if they want to use WiFi.
https://www.restaurantdepot.com/
I don't know if this is a regional only thing but there are brick and mortar restaurant supply stores. You usually need a membership to buy from them but you can bulk buy the same food and supplies that restaurants buy.