I have lived part of the year in Vegas for the last five years. Here are some basic rules:
1) NEVER use an agency. In virtually all cases they will be ROB or the equivalent thereof.
2) TER (without the "B") is an excellent resource for qualifying independent providers ( www.theeroticreview.com )
3) Expect to pay USD $300-$400/hr for services, and higher for a known porn star (many live in Vegas). For example, Ava Devine, mentioned above, her rate is $1000/hr.
4) I'm in Toronto this weekend and will be logging on frequently. Please inbox me if you have specific questions, and I'll be happy to answer them. TERB has been of great assistance to me in the past, it's the least I can do to return the favor.
4a) You guys have it great here! Cold yes, but a great provider scene.