NES Harmonica

If you're old enough to have owned an NES, you no doubt have memories of foolishly blowing into game cartridges in the hopes that it would allow them to play without forcing some sort of improvised wedge into the console. NES Harmonicas ($20-$35) take advantage of this nostalgia by installing Hohner harmonicas in the cartridges themselves, letting you play music while reminding you of your wasted youth. As an added bonus, you also get the game's circuit board in the package, so you can actually play the copy of Zelda that sacrificed its housing for your harmonious enjoyment.