...you could often exercise the 100% satisfaction guarantee.
That entitles you to a 100% discount on a one night stay.
It is, however, only 50% for a two night stay.

In all seriousness, I have found it is often wise to call the hotel directly.
Although I book exclusively with Hilton via its website or over the phone, I used to shop Expedia. An experience there led me to calling properties individually. In this case the Hamptoninn.com rate was about $79, while the expedia rate was something strange like $52.
When I called the hotel to ensure it deals with Expedia, the in-house person asked what rate I was seeing. See said, "huh. I'll book you now for $49."
Worked for me!
...and has a couple of times since.