I have been trying to buy some Pis since before Christmas, namely a Pi 4 and Pi zero w.
Retailers listed on the Raspberry Pi website show no stock of these and have since before Christmas. Just wondered if there is a supply problem??
I just checked Amazon.com and CanaKit. Both show the the Pi 4 in stock. PiHut only has the Pi 4 2GB and Pi 4 4GB in stock.
Should be plenty of Pi4's - production lines have been running flat out for months. Zero's and Pi3 are a bit thinner on the ground due to all production going to Pi4's, but still available and should be getting more available as I write.