Whats the average cost of getting your car detailed?

I have a Chevy Equinox.. and I would like to get it detailed for my husband for valentines day.... it has leather seats, carpet flooring..etc. How much should I expect to pay to get everything cleaned...i.e. shampoo, leather wax, interior and exterior washed..
I just want to make sure Im not going to get ripped off! Thanks for your help!