Your best bet would be looking on Backpage and finding agencies. We know several bachelor parties that have had great success arranging a private stripper party this way. Even if you can only find independent service providers on the site, usually they have some friends that want to come along for the party. Just make sure they send updated pictures (with date stamps) of all the ladies who will be coming as you do not care what they looked like 10 years ago.
Another safer suggestion would be calling the local strip clubs and asking if they have contact information for private parties, or they know of any dancers that offer the service.