If one is diabetic they should check with their physician first. If you tend to keloid you probably shouldn't have treatment. At Gregory System we have treated literally thousands of women and men in the United States and Canada. Once the Clinic Director has taken a medical history and examined the area she might be able to give you a rough estimate. Suffice it to say you will be rid of the hair with patience and regular repeated treatment.
Prices vary tremendously across the country and even within the same city.
However this should be the last question you ask. Training, experience and professionalism are much more important. The coherent light affects only melanin, nothing else, and penetrates to a depth of no more than 5 to 7 mm. The intensity and the duration of the coherent laser light is adjusted to maximize its effect on the hair without casuing skin irritation. Unfortunately not everyone is a good laser candidate.