Been given this link by Vince in the UK who is on the NAXJA site. He was shocked at the re-build prices you are paying and said this place is what he uses.
http://ccgi.vmspecialists.plus.com
He said he paid $3600 AUD for a full re-built exchange engine. The site also lists some parts that might be worth for you guys to bring over as seem much cheaper than what you have been quoting.
http://ccgi.vmspecialists.plus.com/r...74464416becd46