The price is depending on how thick, curly and long length of your hair - will determine the amount of straightening chemical used and the spending time.
Japanese Permanent Hair Straightening
Foiled and damaged fine hair $160 with a trim, approx 3hrs
Wavy hair regrowth of 8months $160 with a trim, approx 3hrs
Very thick curly hair $250 with a trim, approx 5hrs