Discount  Las Vegas Show tickets are available through numerous resources online.

One company, 10 Best Las Vegas Shows, has an upto the minute "Follow the Stars" twitter so you can see what the stars of the shows are doing before you buy your discount show tickets.

BestOfVegas.com , for example, has great deals to the best Las Vegas shows on the Strip. They have great discounts to some of the top shows, including Jersey Boys, Cirque du Soleil, Le Reve, and Bette Midler. Tickets can be purchased online through their website or over the phone. Show tickets will be emailed directly to your online mailbox. Reservation service is free of charge. Along with dicount show tickets they have discounts on the best Las Vegas tours, Las Vegas nightclubs, and Las Vegas hotels.

 

Discount tickets are also available in Las Vegas itself at serveral locations selling same-day show tickets at discounted prices. These booths have a listing of what is available each day at what price (often half price). A service charge is added to the ticket price, but they do accept credit cards. Details and booth locations of Tix4Tonight (there are several on the Strip) are available at their website. Some advance tickets are also available. They open at 10AM, and there are lines. Of course it helps if you have an idea of what shows you are interested in. Then just watch the list on the monitors and see what is available. 

Another discount company operates a booth inside the Coke Bottle located near M&M World and MGM Grand.