Question 1: where can I buy a class set of Raspberry PI 2 Model B or 3 Model B+ ?

All that seems to be for sale are Pi 4s. These need a lot more power and also are overkill for what we need. Are Pi 2 and 3 just not ever being made anymore?

Question 2: Why are Raspberry Pi 3s being sold on Amazon for $200+ ???? What on earth is this about? https://www.amazon.com/ELEMENT-Element14-Raspberry-Pi-Motherboard/dp/B07P4LSDYV/