The price roughly started at double that of a base standard civilian vehicle (selling price), but of course depends on the modifications. Some are clearly far more expensive to build / modify than others. If you take into account XD Defender (Wolf), there were huge sub contractor costs on that as well as the huge development and testing costs. Given the long lifespan of things like XD Defender, its been great value for money for us tax payers. Not so good in the earlier years when vehicles were cast after 3 or 4 years and sold at fleet auctions for 4/5ths of sweet Fanny Adams. This is based on experience with some recent NATO contracts and other deals, but its not a cheap exercise - hence why they are so much better put together.
Line production was all pretty standard - it was when they got sent out to the subcontractors for the really whacky mods that things started to go to eye-watering figures.