I think there used to be a place like this on Soi 7/1 years ago, but gone now (I looked for it! 555). There is a salon opposite Mango Massage where I was offered services while having a haircut, but I'd just come from Mango so totally spent! 555 Though I do think they meant I could have a special after the haircut, not sure if during, but worth a try and ask them.