I just got married and need to make more space for her crap. So, I'm selling my Sharp JC-K99 carbon fibre cassette player on eBay (UK). It weighs in - including battery and wired remote control - at an amazing 99 grammes (the World's lightest). Full details in my eBay ad, just search for the model number JC-K99 Update: someone else is selling same model on eBay, it appears... But it looks suspiciously like a JC-102 and none of the photos make me believe otherwise.
