I recently went to Las Vegas and used http://www.lasvegasnightclubdeals.com
for fifteen dollar vip nightclub passes that cover entry and get you into the vip line.
I usually do not write reviews about compnaies but I am making an exception. We were treated like Las Vegas royalty.
Last month we went to Las Vegas and ordered ten passes to Pure and ten to Moon for a group of friends and we saved at least a couple of hundred dollars.
That night we had a great time and even got to cut line with the passes.
Don't wait until you get to Vegas or your will be paying $30-$40 per entry and you will have to wait in line.