last time i got my rotors turned was $14 for 2 of em. autovalue on macleod. not expensive. be prepared to buy new ones though - maybe $30 each. there isn't a lot thickness to turn em much anymore so age is a big factor. if yours are grinding, chances are they can't be turned as they will have grooves in them.
i'd get a haynes or other repair manual, especially if you have drums in the back.