MusiciansFriend is still selling them.. http://www.musiciansfriend.com/navigation?q=GEM&st=

I've been half tempted to buy the GK_380 myself. There are a few vids on YouTube showcasing some styles, and they sound pretty good.
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.