Quote Originally Posted by rcp
Edit: i read the post by Screwtype above, and the most likely reason you are seeing varying retraining costs in my opinion is due to weapon and armor upgrades being available in said cities, due to temples and smiths.
Nope, if you read all my posts in this thread you would have seen that I checked to make sure there were no temple or smith upgrades available, or generals in the city who might have an effect.

The only explanation for the results I have got that makes sense to me is that the retraining procedure is bugged.