An original Arcade Legends cocktail? You may be SOL. Since all upgrade packs are tied to their installed systems (aka, you can't buy 'em used), and there's an pending indictment on the original creator of AL1 for copyright infringement: http://www.gamesetwatch.com/2009/08/in_depth_exploring_ultracades.php
Hence, AL1's are not sold any more commercially and neither are the game packs. AL2s are still sold by Chicago Gaming Company http://www.arcadelegends.com/ but the packs are not compatible.