HELOFAN,
I recently had a bearing in one of the turbine sections of an Alison 250 fail inflight. (Thankfully it wasn't critical because I was carrying a spare engine at the time.
)
The replacement part cost £45k.
You could probably buy a couple of new Lycomings for that.
As far as I know, replacement parts on newer generation turbine engines (ie Arriels or RR300s etc) aren't any cheaper.