I’ve been buying PI 4s the past year by using the raspberry pi locator.
I’ve bought 4 8Gb Pi 4s in that time, a couple of CM4s, and a zero 2 W.
Having a PCIe interface plus the additional processor power on the 5 is a big deal.
I’m curious to see whether the Pi foundation has sufficient supply in distribution next month on the availability date.
As of just now, there was plenty of US stock of the 4 available: