The soundtrack can be picked up from the Official Double Dragon: Neon website for the low cost of FREE.
If you haven't had a chance to play Double Dragon: Neon yet, get the demo, get this soundtrack, and get in on what you are missing. This collection really brings me back to the days of the SNES and Genesis where games would sometimes come with the soundtrack bundled with it.
If you loved the game, you have no reason to not pick this up, and jam to it as a backdrop to other classic inspired games or even while cleaning the house.