Guys, I just had a terrible revelation about the TurboExpress.
There is like a 90% chance any TurboExpress has been played in the bathroom at some point. Any turbochip that was in there with it is now coated in a fine film of fecal particles. Then, chances are that these games made it back into the used market, ebay, raffles here even! It doesn't matter if you don't even own a Turboexpress, someone was once probably taking a power dump with your copy of Power Golf. Don't think your PCE Hus are safe either, definitely some GT/LT action happening in the ol' トイレ.
At least my obsessive GB collecting is free from this tyranny! No way anyone would ever take a Game Boy into the bathroom.
All kidding aside, I would buy your ToiletExpress (tm) if I had the scratch. I love portable systems. Got a Neo Geo Pocket Color and WonderSwan (not color, sadly) on my desk right now. I never had a Game Gear, Lynx, or TurboExpress yet but one day I will get one of each hopefully with battery and screen mods.