As river985 said, Queens has in the past sent girls to Zona Hotels. I just saw a report on another board that said he had
a girl from Foxy's come to Cascadas. I've also heard that
CuminTJ will send "some girls" for "some guys", but that's YMMV. I even read one great report of a guy who engaged his
Musa's date after hours to accompany him to Hong Kong bar and take a girl up to Cascadas for a threeway.
Mexico Lindo Bar has
a list of hotels that they have approved for sending their girls. It is not a complete list, but it's a good start for a casual visitor.
That being said, if you are at Cascadas you have other options for girls besides agencies