Fiber optic hexacopter with 41 km range and anti-tank shape charge warhead.

Less than a Javelin Missile.

SM fiber is dirt cheap, they don't need to wrap it in kevlar like you'd find in data centers ironically enough, it's just a strand or two of thinly jacketed single mode fiber.

Only has to survive the one flight, be light enough and long enough.

Cheap fiber is about $0.40/m.