These are hustlers who will take you to apartments where there are working girls. The barber shops are expensive near the big hotels, same as with the hustlers. Quality of the girls does not seem different. Few people speak English, only Chinese. Take a Chinese phrase book and pencil and use them for negotiation for negotiation.
Negotiation is a bit tedious, but it can be done.
Each barber shop has about 6 girls. You can negotiate price. Make sure that everybody understands before ending negotiations. Insist on paying the girl in the room. The apartment is the dormitory for the girls and you will have the bedroom, the rest of the place is filled with beds for the other girls.