Wiardgroup

I am in the midst of a large modcan b series purchase.  I have heard 
things that the Wiard can do that appear to be different than many of 
the other modulars are capable of, other than perhaps the Buchla.  

How hard is it to get the Big Blue series of Wiard?  How expensive is a 
relatively full (six unit) Wiard?  I have heard that artheritis is 
keeping the builder from making the older style anymore.  

Do they come up for sale often?  Are they as special as I imagine they 
are?  Why?  

Thanks