Sears is the one that really gets me. In addition to full stores in big enough centres, they had depots everywhere and their own trucking network. And I mean everywhere. Suburbs, towns, villages: if there wasn't enough business to support a standalone depot, anyone could apply to set up a depot as part of another business. I even saw one once that was basically run out of someone's house. They moved into the top floors of an old boarding house and set up the main floor with a small museum, craft and thrift store, a bit of a cafe, and a Sears depot. I think they were also the bus depot. Any gaps in the trucking network were filled by sending stuff out on the train or bus, in the post, or with a small trucking company.

The logistics were handled and a very large fraction of their business was already mail order. All they needed was the online presence, and it's not like they didn't have customers practically begging them to do it.