Tix 4 Tonight has 4 locations in Vegas, which is nice. We happened upon 2 of them during our four day stay. It seems almost too good to be true at first, but they're legit- they really do get you cheap seats to the good shows, or 50% off entrees at the super expensive restaurants all over Vegas. The only trick is that it's same day (or sometimes next day) but so what?
We got half price tickets to a show of Cirque du Soleil's Mystere only a couple hours before curtain, and still walked over to Treasure Island in time to reserve fabulous seats. We also recommended it to my uncle, who was going in a party of 40 to Pampa's, a somewhat pricey Brazilian steakhouse. What a great idea! I love this place.