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An Example: HDD Price Development Before Black Friday (Single Sample/ Product Only)
(external.binaryriot.org)
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
I highly recommend the Keepa extension on chrome or the like (camel camel camel, etc.)
Here is their chart for the last year (US pricing) - https://i.imgur.com/pKoSanC.png
Thanks for the recommendation, mate. I didn't know it was a thing, really appreciate it.