Amazon Sale Calendar is a free calendar you can subscribe to on Nundina, with 7 dates listed. Data from Salendar. Subscribe to it on Nundina and every date lands in your own calendar, updated automatically.
Amazon's year-round sale calendar: Big Spring Sale, Prime Big Deal Days, Black Friday week, Cyber Monday and other seasonal deal events, tracked by a third-party sale-calendar site. Prime Day itself has its own dedicated source (read from Amazon's official announcement) - see "Amazon Prime Day".
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