Flyaway cost is only like 1/5 of an aircraft's actual cost.Few years ago, I read that unit cost of F-35 was less than $ 80 mio. Thats affordable.
There are multiple metrics to figure this out and project some numbers, these metrics include even the fuel burned and the inflation in to the mix to come up with a lifecycle cost.
Canadian budget office came to 74 billion CAD for 88 aircraft over 45 years. so that's 608 million USD per aircraft during its entire 45 year lifespan.
US GAO came to 2.1 trillion USD for the entire 94 year projected lifecycle of the program for 2454 aircraft. About half of that 2.1 trillion is projected inflation for the next 90 years. If we take a per unit basis, it's 815 million USD per aircraft over the entirety of the program.
F-35 has the fortune to be the most produced aircraft of this century and it will most likely keep that record with 1200 aircraft built so far. So per how mathematics works, it will always be the cheapest to procure but its related operating costs mostly remain high. Because of added complexity in every kind of operating procedures, security needs, fuel costs etc.
We don't know how much Kaan will cost, only start of a number we have is the 10 billion USD figure for Indonesia for 48 aircraft. This most probably doesn't include any weapons but does include at least some part of lifecycle costs for training, maintenance etc. That would mean a single Kaan for Indonesia will at least cost 208 million USD; and that is probably just a starting number, it's only what TAI and SSB will sell to Indonesia, not what Indonesia will actually pay for over the type's lifecycle.