I've been reading about shipping times for the 2021 14 and 16" Macbook Pros slipping, and seeing people suggest that they look locally. I was able to find my machine locally last November, but looking is really luck of the draw. You can't really be sure when inventory is updated. I started looking for an Apple Store inventory checking site (like people use to get Playstations and graphics cards) and instead found a script that someone wrote specifically for the purpose of checking Apple Store inventory to look for these machines. Even better, someone took the script and put it into App form. You put in your preferred Apple Store, choose the models you want and it checks at an interval you set and shows you a list of every model currently in stock at local stores and will notify you if your model comes in. It can even search for custom configurations. Hope it helps some of you.
Script:https://github.com/worthbak/apple-store-inventory-checker
App: https://worthbak.github.io/inventory-checker-app/
Script:https://github.com/worthbak/apple-store-inventory-checker
App: https://worthbak.github.io/inventory-checker-app/