While some may know this, others don't, so it's worth telling all. 1. Vegas hotel room rates literally can change every day, sometimes by large margins. I just finished booking my Ballys + HR and Ballys fell $10-20 a night. And believe me, it may fall more or go up more than it was before. You just don't know. 2. I prefer to book directly from the hotels themselves. Generally, they do have the lowest rates on their websites and often dont know (on the phone) that such internet rates exist. For example, I just booked a Sunday at HR. One site had it at over $220. Another had it at $100 last night and sold out tonight. HR operator said something over $200. And the HR website - $116. If you see something cheap, grab it. You can always cancel if it gets lower but you cant get it once its gone. Remember, hotel websites tend to be the cheapest 9 out of 10 times.