it's probably time to fire the negotiators.
All this for basically the same vehicle!
Don't even try to explain this with inflation, training packages, spare parts packages or added gadgets. It's futile.
The Saudis are notoriously poor price negotiators and overpay on many arms imports (in public; in practice they buy so expensively because all the bribes add to the price tag), other countries' heavily armed bureaucracies spend too much as part of some industrial policy.
The data from above is a representative (not a lone wolf!) for another kind of waste; outright incompetent negotiation of prices.
For comparison: A custom-modified armoured street vehicle with VIP luxury features for politicians and the like costs about 500 grand.