Most recently, there is a
Vinyl release especially for the music of Revenge of Shinobi/The Super Shinobi game.
But if you can't play vinyls, you can search for
Legend of Joe Musashi: SHINOBI Music Collection which is very good if you are a Shinobi fan.
The album is from 2009 so i guess it's out of print everywhere.
Currently, there is 1 for sale on
YJA and 1 on
eBay.