[alkonaut]

Unit cost is always a difficult measure because any purchase also involves agreements on counter investments, how much of the plane you can license build yourself etc (with F-35: probably not much!).

There is also the much more important measure of total lifetime cost. Flight hours are expensive for the F-35 compared to many 4th gen fighters.

I find it difficult to see why a plane designed to work stealthily in contested airspace would be very attractive for the role European air forces like Denmark or Norway have.