There are some cheap offers close to the main train station(Hauptbahnhof).
There are mainly three streets in where you will find some street action going on.Steindamm, Bremmer Reihe and Ellmenreich, they are parallel to each other. Depending on the time you will see more girls, but do not expect to see that many. Usually after 10-11 pm you will find up to 20, and I have found as well at 5-6 am , after partying whole night, some girls.
The action begins by a casino at the beginning of steindamm and all the way
until you reach the traffic light, they are always on the left side of the street,
then you have to walk back by the other street(Bremmer Reihe). At the corner between Bremmer Reihe and Steintorplatz, and at the corner between Ellmenreich and Steintorplatz you will find from time to time some good options.
The price range between 20-70 plus room, for french and sex, 30-45 minutes in a hotel located near by. Usually the hotel won't cost more that 11 euros, but once a girl who was gorgeous and had big boobs wanted 20 for the room.
Lately I haven't been there, but I have seen there junkies which usually charge you 20 euros and as well some decent girls, which charge you 50-70,
sometimes you don't find anything good, it is a good option for a quickie/cheap sex.
There are other options, you could visit the eros and lauf haus located in reeperbahn, so far I haven't heard about any rip offs there, usually the girls on the first floors would charge 50 for half and half(french and sex). Some of the girls on the upper floors would charge 30, but the quality is not as good as in the first floors.
You have the option to visit on the other side, the well knows windows, and the street hookers there, but I haven't tried on the other side and I don't feel
that confident about those offers. Even though there are some really nice girls.
Just to keep in mind.
You have to negotiate everything before you accept, otherwise some of them might get pushy and they would want to finish the session after 15 minutes or they would refuse to do different positions.
Some of them are willing to do bbbj, and some of them are willing to do anal,
but you might have to pay a little more.
I think just a couple of them on the street speak english, usually in reeperbahn is easier to communicate in english; so you might need some german.
Wie viel? -> How much?
Wo? -> Where?
Wie lange? -> How long?
DO SOME RESEARCH!!! before you head to Reeperbahn, I have heard about some people being ripped off there, but you have been going to the wroing places.