Sure, where can I get a new one at comparable Pi prices?

If you're buying Raspberry Pi's, either the form factor or power requirements really worked for you, such as if you're in robotics, IoT sensors, or hardware-adjacent stuff, or you knew you were spending a little bit extra for the hobby space.

That includes all the people setting up home labs for their own learning. An M1 is about $250 refurbished under Amazon's protection program. If you intend to use this as a hybrid device, which many frugal people do, then you'll also likely be using this as a desktop device connected to a monitor. The cost of electricity will rival your purchase in a year.

If you're gonna buy a throwaway computer for a child to experiment with, IMO a used Mac Mini delivers unbelievable price efficiency as a general-purpose computer. Use it as a server, use it for programming, use it for homework.