Not the cheapest option, but GGG (Groovy Game Gear) has Clear pushbuttons. I don't think they are on the website, but you can email them for availability. If you combine that with black (or whichever color you want) pushbuttons you can achieve the same effect. As far as I know, GGG doesn't offer the option to combine clear with a colored button like Paradise Arcade Shop. But, you might ping GGG to see if that is an option or not.