I like your idea. Lots of countries have cheap ladies.
Sosua, DR, has ladies for ST 1000 pesos (25 dollars) and longterm 2500 pesos.
Tijuana has streetgirls all over the place for 200 pesos or 15 dollars.
Rio de Janeiro girls go for 40R-100R in centro, which is 20-50dollars.
But airfare is a problem. The airlines have jacked up fares to many mongering sites. Rio used to be $500 from the US, now $1400!
So when the concept of cheap ladies is flawed I learned when you add in airfare and hotel rates.
That said for an American Tijuana and the DR cannot be beat. Probably Costa Rica in third.
Tijuana requires a domestic flight to San Diego only. You can stay there (check TJ thread for hotel info) in SD on the cheap near border on trolley line.
Sosua, DR is really cheap. Once down hotels go for 35-50 per night.
also check out
http://www.amazon.com/dp/B009JWTQAA to learn about some cheap mongering information.
Though the book is aimed at the bros, it is usable by all mongers. And all should read it, for sure. It helped me understand a lot.
CG