Going rates at La Barba Negra (Blackbeards)
The most the girls are allowed to ask for is 3000 pesos for all night, or 1500 pesos for a quickie. You can bargain for less, but most of the guys there do not, because if you just give them the rate, then you don't even need to discuss the price, which is probably more enjoyable. You can just slip a few bills under their cell phone, or some similar place and that is it.
Also, remember that all your personal information will be shared on the chicanet communications system, so if you get a bad rep, don't be surprised if the best girls avoid you.
If you have a girl for a longer time, like several days, then you may want to negotiate something different. You will, of course, be paying for her meals and drinks, and she will be charging to your room, but IMHO the more you do to make her happy, the happier she will make you.
Having had both LTRs (relatively speaking) and quickies, and having had quickies with other people's LTR girls, I would say that the girls prefer longer relationships with guys who they like, and while I am not advocating monogamy, it is generally true that when you have more than one encounter with a girl, if you liked it the first time, it will be even better the next time. Most girls will try to get you interested in a longer arrangement by pulling out all the stops the first time around, but if they know that you are a serial single encounter guy, they may put out less effort.
Just my 2 cents worth.