Vegas - Best bet
I lived in Vegas for over 10 years and I travel there several times a year. The best bet there isn't to go to a ranch, and it isn't to use the street magazine (worst place).
The best place is in fact to use
http://www.eros-lasvegas.com/eros.htm and pick from there girls who state they are not from an agency. Also, greasing the concierge a $20 or $50 can also get you some of the best talent in town. These guys are usually well connected (make sure you get a guy that isn't green tho).
Then, when on the phone, make sure you explicitly state that you are looking for a flat rate per hour all inclusive GFE. They will either a: hang up on you (this is a suree fire scammer/B&S) or b: they'll agree to it.
Then, most of the time, it's YMMV whether she will do a true GFE or something less (but will include full service).
Also, the bar in the middle of the mirage (near the elevators) or the circle bar in the venetian, or the middle bar at the Wynn are excellent places to find girls - that's where the good ones hang before they go out.
I've had lots of girls from the bar, and it gives you the opportunity to chat them up and understand exactly what you can get without paying, and trust me - I've had some unbelievable times there.
Bottom line, you have to play hard ball - the deal is this - if they rip you off, jerk you around, are unwilling to do what they represented, then you can really scare the shit outa them by stating that you will call security - and make sure you explain the cameras in the elevators, casino - that they will get blacklisted. also, filing a report about her at the bar you picked her up at is a goodidea too to throw in - you can suggest taht she con'd you into coming up, and then took the money from you. 99% of the time when put under duress, these women usually will give you back the money or comply.
Life is a lot harsher down there for girls working - Pimped out really is hardcore there, and that's why the indies are the best to go with - because they are more likely to give you a dramaless experience.
Hope this helps.
Oh, and for the swinging fans, try the Green Door near the Hilton/Convention center - taxis will know

This place kicks ass on the weekend. Lots of single girls for free.
-- mojo