Got the price for the abacus ks1
that's DEM 7900,-- which is US $ 4.200,--

that's a lot I think.

fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76