First, and this might already be something you do, but for those that do not it will save you about 40% on your airfare and hotel. You need to package these together with one of the many online websites that you can use to do so. This will save you quite a bit of money and that is what we are after. Also, if you are planning to rent a car, then you can either package it in as well or avoid the expense all together and just get a bus pass because their public transportation is pretty awesome.
Second, you will want to enjoy the cheapest Las Vegas shows by either shopping around for buy one get one free tickets or by going to the free shows that some of the hotels hold. There are a handful of free shows that are pretty incredible that you can go and watch. You just need to pick up a show guide once you get there so that you will know the times and the places that these shows happen.
Last, if you really want to have the cheapest Las Vegas trip, then you need to get yourself one of the many coupon books that are floating around out there. Sure this might cost you a little bit of money to get, but you will be able to save so much money while you are in Vegas that it will pay for itself over and over. These books have buy one get one free for dinner, shows, clubs, and more. There is even some free gambling money in some of them.