Any experienced/knowledgeable college player is between $60-$80 an hour.
Top tier D1, MLL or Coach are usually $100 an hour.
D1 coaches are $200 an hour.

As one post stated make sure you do an individual lesson so your kid gets as many touches as possible. A good Coach will finish the lesson no matter how long it goes over the 1 hour without charging you any additional money.

Lastly, MC has told us numerous times grades, grades, grades is most important so spending money on tutoring is a fantastic idea.