Data-Discs have released Super Hang-On, OutRun and Space Harrier digitally on their Bandcamp page, joining their existing catalogue with soundtracks from Streets of Rage 1, 2 and 3, and The Revenge of Shinobi.
Bandcamp: https://datadiscs.bandcamp.com/
Price per album is £6 ( ~7€ / ~$8 )and offers streaming in MP3 as well as digital download in lossy and lossless formats, ranging from MP3 to AIFF. These are the same soundtracks, that Data-Discs has previously released on vinyl records.
Out of the 3 soundtracks that were released digitally today, currently only Space Harrier has vinyl in stock. While Data-Discs has plans to repress other records from their catalogue, no announcements for any specific title have been made yet. You can keep up to date with their email newsletter, which in case of new releases, also grants you early access with unique password.