In 1960, Emerson released the Wondergram or as it was touted "The Worlds Smallest Turntable". It was a portable, battery powered record player, complete with swing out tonearm and speaker - all housed in a compact metal case.
Check out the video to see how it works.
Based on some recent auctions, a working model could be found for anywhere from $40 - $60.
Definitely an interesting conversation piece.