I'm staring at at one of our EC135 T2 aircraft right now, that iis in for a 1000hr inspection. So far we have on order to replace:
-One main rotor blade - $62,000 repaired, $128,000 new
-Several main rotor flight control mixer components - $15,000
-Two engines firewalls - $17,000 and $6,000
And a bunch of other tiny, random, expensive pieces. Aviation is n't cheap. The bigger the bird, the bigger the prices.