Being the owner of an out-of-warranty Bimmer, I have been searching for OE or original parts The only part I Amazon'd was the Bosch wiper blades. After using FCP, ECS I have also found a bunch of dealers online that are actually dealerships running a side hustle offering discounted genuine parts, sometimes better than those sites. Although FCP and ECS offer lifetime guarantees on parts, there are times that someone would want to sell a car and can give a care less about lifetime replacement. And the one I primarily use won't charge shipping if you will-call pick it up, they're only 30 minutes away.
So my curiosity led me down this rabbit hole of finding all the USA based dealer side-hustle sites, perhaps one near you. They seem to use SimplePart and RevolutionParts as their platforms.
https://1drv.ms/x/s!AnyVvW0FxzZegeth...0M0NDk1QTY3Qn0
Hope this helps someone out. I'm sure someone is going to say "but we already knew this" and that's fine.