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Availability Level. Use this filter to get a list of the readily available cassettes.
It seems that Shimano website only lists the specs for their latest models. Eg: They have a page for HG50-8 but not HG50-7. But numerous websites list the HG50-7.Level 1. Rare: Cassette models that exist, and are still available on Amazon, etc. but not listed in the majority of websites.Level 2. Older: Available on multiple websites such as Bikeman, Amazon, ChainReaction, ModernBike. But not listed by Shimano. And not in stock at MEC.Level 3. (Current) Available everywhere. Cassettes that are currently available in Canada from most of the major stores. Eg: check MEC website.
From the document: Cassette Filters