Concerning the 3rd Party :

First of all, most of the hotels appear on different 3rd party websites and not only on the Official Website. You can have an access to a good rate for the same service and also at the same date. 3rd party websites can be for example websites like Expedia, VirtualTourist, Hotels.com, etc...

* Expedia :

If you find a better rate on another website than Expedia, They refund the total invoice of your booking.

Now, regarding Best Rate Guarantee :

For this exercise, I have chosen to take the example of Starwood Hotels & Resorts. Indeed, as you can see, this chain suggests to its guests the possibility to obtain a reward of 2000 points or 10% in supplement on the lower price we find in other websites / channels compared to the official website.