The zaniest adventure of Billy and Jimmy Lee is available for PC players today, as Double Dragon: Neon arrives on Steam. You may now purchase it for the perfectly reasonable sum of $9.99.
Setting aside all of the awesome music, goofy plot line, and absurd villains, it's still my favorite Double Dragon game. There's a satisfying technical depth to be found in the combat and the addition of the game's collectible progression system has kept me coming back over and over. If you're into brawlers and haven't played this yet for some inexplicable reason, you should probably get to it.