If you are looking for discount on show tickets, we recommend that you visit a Vegas Tix 4 Less location, this is a stand that sells same day show tickets to most of the shows in Las Vegas. You simply have to buy them the day of the show but you get a better deal, because they are trying to fill the empty seats.
Find a location near your hotel, and see what daily offerings that have. The earlier the better as some of the popular shows will sell out. Most locations open at either 9am or 10am.
Here is a map with the locations for Vegas Tix 4 Less.
You can also call their customer service at 866-742-0784 or 702-492-3984.