Let me directly answer your question, from experience, not speculation
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The price ranges are $9 to $60.
At night I used to pass this thin, light-skinned little street girl named Adrianna all the time. She worked in front of, and out of the Diamonte #1 SG hotel. She actually had the kind of small, thin frame that I go for, but her face was a turn-off for me - to me she looked like a female version of Howdy Doody.
A little game that some SG play with me, and other mongers that pass them repeatedly, is to throw little folded up scaps of paper (sometimes it's candy or gum wrappings) playfully at the mongers that walk past them. It's just anther way to get the monger's attention.
Adrianna had done that to me a few times last winter. At night the area where she was standing is pretty empty. But in response to what she'd been doing, I started to stop, walk widely around her, even stepping in the street, in an exagerated manner while I covered my face from her paper projectiles. One had actually hit me in the face at one passing, so this was my way of playing back with her.
One time as I was walking past her, and giving her this wide berth, she calls out to me "Suckie $10!". I smiled and continued walking. But the next time I passed her (one night later) I made sure I had my SG pack with me. I stopped and asked her if she still was willing to give me suckie for $10. I even clarified that I had pesos, and "Es cien pesos OK?". She said "Si".
The Diamonte #1 charged me 40 pesos for one of their crappy S/T rooms and Adrianna seemed to like the flavored condom I pulled out of my SG pack. She tried to upsell me for more services for more dinero, but I told her the 100p BJ would be OK. She sucked me right up until the knock came, unfortunately I didn't. But for her good effort I think I tipped her $2US. A couple of months later I took the same deal from her, and even got a yes to a feenishing HJ as the session time grew near its end.
I've had plenty of 100 pesos sessions from SGs, and my spanish sucks! Nearly every SG I approach is started off with a 100p offer. But usually 100p sessions just involve fucking the SG in one position, while she keeps her top on (a con ropa session). Most of my sessions end in HJ's because I rarely cum with a condom on, but I generally don't contract out for just BJ or just a HJ. But Full Service sessions (BJ, sin ropa, fucking in multiple positions, and a feenishing HJ - all in 15 to 20 minutes) can be had from many, if not most, street girls or walkers for 150p to 200p ($14 to $18). Bar girls tend to offer F/S 30 minute sessions for $40 to $60, but exceptions exist.
I know of another monger that specifically requests sin ropa HJs from the street girls.
No BJ, no fucking, just a clothes-off HJ.
And he typically pays 150p or 200p for that.