Lowest price I've paid was $16.00/half hour at Arkada in 2005. I could never bring myself to do the Fellini Ranch on calle 6. ($12.00).
I also encountered a street girl who offered everything for an hour, for ten bucks. My wingman got me out of there pronto; the girl was at most XXXXX.
Looks: The girls make the choice, not you. If you're heinously ugly (obvious facial deformity or something), many girls won't go with you. In my experience, guys with "average" looks generally do as well as better-looking guys and for the same money.
On the other hand: Some guys just "have it," game and/or grille, and chicas are attracted to them.
I don't know if he pays less, I suspect he does...one of our esteemed CRT brothers is so popular with the chicas that he's always surrounded by the most beautiful women in town...they love him.
Guy's bald and 49 years old, but he's maintained his physique and has a voice and manner that the ladies seem to love. He just posted that he frequently gets TLN (toda la noche/all night) for under $120.00. So maybe game and looks have something to do with price.
I will tell you this. You might not be able to instantly become more handsome, but there are things you can do to enhance your chances of finding a beauty for a reasonable fee. Hygiene. Clean clothes. Smile. Easygoing manner. Speaking some Spanish. Staying more or less sober before/during the sex session. All these things will make her more comfortable.
Have fun.