The trick is to book this Westin as soon as you know you are going to be in Vegas.
I knew several months ago I would be there and got a rate for this Saturday night for $134!

This rate is Cancelable two days prior!
For laughs I priced for the same night: a staggering $395 a night, pre-paid Internet non cancelable. PRobably the rates are a premium because of the "Parrotheads" Convention that Saturday night at the MGM Grand. (I'll be there with hat on!)
Looking forward to staying there again.