Scraping 20,000 physical stores (most of it didn't work)

Last year I needed a specific door lock, a FAC 946RP, for a project at home. I knew which part I

wanted. I could not find out which shop near me had one on the shelf, and that was the only thing I

wanted to know.

I got an Amazon listing with two-day delivery and a couple of dead forum threads. No shop. Finding

the answer took forty minutes. The lock cost fifteen euros.