No, it's not too expensive to get it done. The shop I use charges 200 flat fee plus mallory metal. You should be able to get it done reasonable.....BUT the cost of the Eagle cast steel cranks are around 275. I would keep that in mind.
this is exactly how im thinking...if its going to cost that much, then maybe i should just bite the bullet and buy a new peice...i havent heard much good about the eagle stuff though, atleast from what ive heard others say (no experience myself)