[QUOTE=JustLikeHeaven]The Super gameboy did seem to be pretty successful...the gameboy player, not so much. Go try to buy a gameboy player new online at ebay, they cost $150! If you're lucky you can still find them used at ebgames for around $30, but brand new is another story.[/QUOTE]
The Gameboy Player was pretty successful. It met Nintendo's targets and helped to push the Gamecube as well. I realize you can't get one new anymore, but that's largely because they aren't made anymore. They weren't intended to be made for terribly long. Having said that, I can get a full unit that is like new at a Gamespot for about $30. If they were completely unpopular, they'd be far less than that, and the same could be said for the new ones at $150.
I can't speak to the sales of the Super Gameboy. All I can say is that everyone I knew owned one. Since there are a good many gamers who simply aren't handheld gamers, it's always been a near necessity or at least a strong preference for some of us to play these handheld games at home on our television sets. Until the DS, I really didn't care that much for handheld gaming, though I did own the systems and games and played them on occasion. Until the DS gave me a unique experience that can only really be a handheld one, I literally had no reason to game on a handheld by preference. Heck, I even play my PSP on the television using a Nyko adapter.