Kamikaze FPV drones starts from $400 (without warhead), from $1000 if it has 20km of optic fiber or is an interceptor. If it is not a kamikaze, like heavy bomber or reconnaissance - $10k+.
How much does 20km of optic fibre weigh? Why don't these fibre strands suffer from the same physical limits as cabling used in suspension bridges? To be clear: I am not doubting that multi-kilometer optic fibre controlled drones do not exist. There are plenty of highly quality news sources and YouTube videos about them.
Extremely affordable!