A Permanent Wave.
In Munich, Germany, there is a hairdresser called "Temple of Hair" where you can get your hair cut. Or washed. Or blow dried. Or all three. They also do other stuff like Keratin treatment.
If you go on their website to look for the price list, you may read a very interesting information.
Look closer!
Closer!!!
Yes, you see that right.
Dauerwelle, which is German for Permanent Wave, you can get for 2700 € which is about 3700 $.