Maybe not the exact model you're looking for but there is a
Cambridge GPS20, Nav display S-NAV and vario listed on GliderSource.com
http://glidersource.com/cgi-bin/post.cgi?id=220

On Sunday, July 22, 2012 4:15:36 PM UTC-7, Thomas Johnson wrote:
I'm looking for a Cambridge
model 25 GPS-NAV "brick".

Just the Model 25 if possible.
I really don't need all the other
parts of the system as I have them,
but I will consider a complete
system if cheap enough.

Thanks, TJ thojohnson at frontier dot com