I used halfpriceshows.com onMarch 24, 2011 to see a magic show at the Sahara. The tickets were the least expensive anywhere around. I ordered online and prinited the email confirmation and took it to the box office window at the hotel. There was no record of my reservation at the box office. The box office did give me tickets to the show but I think it was only because there was a line of people behind me and my issue would have held up the line. He looked at the email confirmation with some confusion but again I believe we were allowed entrance simply because this was not a sold out show and because he needed to move the line along.
I cant say whether or not halfpriceshows.com is really a legitimate outfit and I would not recommend anyone use the service it could be a scam to get your credit card number. If they are legit then I got a good deal on our magic show tickets at the Sahara.