Try Lifestyle Av i bought one from him a few years ago in mint condition for £70 or Ebay... they was a guy in the US selling them for $100, new ones are around £150
BS-3, BS-1, BS-OVERTURE, AVANT-28"RF, AVANT-28" DVD, AVANT 32" RF, 3xBEO-4, LC-1, 4xBEOCOM-6000, BEOCOM-2, A9 KEYRING, DVD1, Beosystem 10, BEOCOM 3, BEOLAB 2500, BEOSOUND CENTURY, BEOLIT 707