I have a new Chase Sapphire Reserve. I'm looking to book a Vegas hotel like the Aria, Venetian, Bellagio, Caesar's etc at a good price. I checked out Chase Ultimate Rewards but the prices are really high ($350/night at lowest) and I see no deals/discounts.

Online I'm reading about Chase Sapphire card-holders booking the Aria for <$200 a night and I'm wondering how to find deals like this?

Thanks in advance for the help, I really appreciate it.