The online landscape for cassettes is divided between specialized platforms and massive marketplaces:

A massive database and marketplace where collectors can track the "provenance" of a specific pressing and buy from international sellers.

The J-card (the fold-out paper inlay) offers a canvas for art and lyrics that feels more intimate than a thumbnail on a screen. Where the Market Lives

Online marketplaces provide access to out-of-print 80s and 90s gems that are no longer found in local thrift stores.