Costs will probably vary depending on where you go. I know that where i work we charge 250 for the first 15 minutes and 125 each additional. The area time depends on what area and how much hair, thats why we do consultations first, its to hard to determine with out seeing you. I would imagine depending on what you want done it would be 15-30 minutes.
Also remember, this is not a one time treatment, it can takes 6-10 treatments, that you need to do every 4-6 weeks without missing any and it is FDA approved for reduction only. No one guarentees that you will never grow hair again. It usually requires touch up like once a year or so. Mostly for men, because of testosterone mainly, makes hair grow. Meds and other things can also change how your hair grows.
Hope that helps somewhat, i would call around and see what kind of pricing they give you.