Reason you cannot find any prices is that he charges for what work is needed mate.
Im pretty sure he has a price to strip and a price to build back up but the required work price will always vary, to be fair all transmission places I have been to work in this way.

He has done good work for me in the past on my diffs and I have never had any problems.
He rebuilt Coleyst200 gearbox and he has had no issues at all.
He has done all Marco's gearbox's and diffs for him to.
To name a few

Only bad thing I can report is that he likes a chat so I always hit the rush hour traffic when leaving, lol