Dallas was a visiting provider with a (214) area code, who has since taken on a (702) code.  Girl answering phone said fee was "at least $$$, depending on what you want."  Classified as an indy, but sounds like an agency.

Did a little bit of research, and found several girls with (702) 362-xxxx phone numbers and lv-black3- URLs, which seems to indicate vegasblackbook.net.

Dallas http://www.eros-lasvegas.com/files/lv-black3-dallas1.htm
Deja http://www.eros-lasvegas.com/files/lv-black3-deja1.htm
Cierra http://www.eros-lasvegas.com/files/lv-black3-cierra1.htm
Dior http://www.eros-lasvegas.com/files/lv-black3-dior1.htm
Daisy http://www.eros-lasvegas.com/files/lv-black3-daisy1.htm
Angelina http://www.eros-lasvegas.com/files/lv-black3-angelina1.htm