parts sources and PD software?

[Patrick Tufts <zippy@berry.cs.brandeis.edu>]

A few newbie questions:

  Where are the good inexpensive parts sources for the 3640 and 3670 series?

  What's the market rate for a used MacIvory 3 board?

  Are there any general Symbolics utilities in ftp-able archives?
     (I'm aware of the comp.lang.lisp faq - I'm looking for system-
      specific PD utilities, not AI implementations)

  Finally, is it possible to upgrade from the L-series to the G-series
     (3640 or 3670 --> 3650) by doing a board swap, or is it hairier 
     than that?

--Pat