SK880,
I sell the SPD20 and add ons at my store. I can quote you a price tomorrow when I get there. Again, as I stated earlier to you, most drummers feel the most comfortable playing on real drums and there are ways of muffiling drums to suit room acoustics. However, Uncle Daves suggestion is a good one for a low end electronic drum set which would be better than the Yamaha DD55.
George Kaye
Kaye's Music Scene