When I have chosen the tyres I want, I just leave my local indie to obtain some. Generally, they can at a price comparable to Black Circles given a couple of weeks notice.
I am a bit of a captive as they have my winter tyres in store.
My Alpins are yet to be fitted this winter. With lockdown; little chance of a skiing holiday, and the MiTo for local journeys I couldn't see the point to paying for the changeover. I don't have a second set of wheels.