Do a search in the engine rebuilding forum. Depending on the severety and location of the broken studs you can do enough damage running that way, extensive machining may be needed.
For cost, it depends on how much you can do yourself.
Drop the car off at a mechanic=$5,000
Drop the engine off at a mechanic=$4000
Buy all needed tools and do it yourself=$3500 and the value of the experience.
Have all tools and do it yourself=$1000 for parts if you don't get bitten by the "while you are in there" bug...
