out-of-print record; out-of-print CD
Refers to a music recording (vinyl, CD, etc.) that is no longer being manufactured or sold. Often used in the context of collectors or discontinued albums.
このアルバムはもう廃盤になってしまった。
This album has already gone out of print.
廃盤
I'm looking for a CD that's out of print.
廃盤 means a product has been discontinued, the opposite state from 新発売, which marks its launch.
Compound of 廃 (hai, 'discontinue') and 盤 (ban, 'disc/record'). The exact historical derivation is uncertain, but the word is conventionally associated with the discontinuation of phonograph records and later CDs.