Yeah as mentioned, Cabaret and RP are the best places to try for it.
Don't go on the weekends because a crowded club might make the more cautious chicks turn you down for fear of getting caught, and there's more competition from other guys.
Basically either get a lapdance there out in the open then while getting the dance ask if you go to the VIP with her if she'll do any extras. Or get a VIP dance from her and while she's doing the dance again ask if she does extras.
A couple of chicks might say no, but that's just the way it goes. I've been turned down by two chicks, then a third one came sat on my lap, asked if I had any rules and when I said no she got me hard put a condom on me and went for a ride. If you spend money and ask around the chicks just there to dance will usually tell the ones who offer more that you're looking for that.
Just remember to ask about a price and for how long before anything happens, you don't wanna be one of those dudes who only got a ride for half a song and now the chick is asking for $250. Its a long walk from the VIP to the front door of RP, and some of those bouncers look like some quick fellas.