I think this is the point I was trying to make, but didn't make as clearly as I wanted.

Sure I could buy two or three different types of keyboards within walking distance, but none of them used my favorite mechanical switches. I was constantly facing choices where I would either need to travel by vehicle to a speciality store (train, bus or car), or I would order the item in. Judging by the flow of packages into my multi-residential building others were facing the same choice.

Sure, but 98% of what you buy is is either in the set of SKUs near you or substitutable for them. Near you only applies if you live among actual density of course.