To add to this....
So last year, I negotiated my existing room rate. It was Thanksgiving and Priceline was offering a Black Friday sale for the next couple of nights. Contacted my hotel (Riverside) and asked them to match it. They found a special offer in the system that was slightly less expensive and offered me that.
If you're like me and work for your living, you probably don't want to have to spend a penny more than you have to. I'm just surprised to see them partnering with Priceline, including in Express Deals.
For this Thanksgiving coming up, I found a lower rate with a better view on Priceline than I did on the Disney site. Was an average of $263 a night with a pool view vs. $268 a night on the Disney site for a standard view.