You should look at Israel deal for the F-35. They got the only F-35 unlocked and non dependent on the US software lock. They were never part of the development program like Norway, Denmark, Italy or the Netherlands so did not have to bear those costs. Norway, Denmark, Italy or the Netherlands, still had to pay for their F-35...

Israel paid 2.3 Billion for their F-35, but the US committed to buy 4 Billion from Israel defense firms, so concluding with a net positive of +1.25 Billion for Israel economy....all at the cost to the US tax payer. :-)

"F-35I Adir: Israel’s Custom F-35 That No Other Nation Has" - https://www.19fortyfive.com/2025/04/f-35i-adir-israels-custo...

https://en.wikipedia.org/wiki/Lockheed_Martin_F-35_Lightning...