Disklavier

Earlier this year, I bought several PianoSoft Plus diskettes at very 
good prices, like $21.  I didn't buy them from Yamaha, obviously, but 
I did get them on the Web from a company referred by some DUG 
members.  I cannot find the name of the source.  Can somebody give me 
a clue as to who carries PianoSoft diskettes at discount?  Thanks.  
Stu Miller