I’m not sure how they got in this, but this article on Yahoo! Finance mentions the Four Points by Sheraton Niagara Falls Fallsview as a top travel deal on Groupon:
And, finally, the best for last — honey moon destination Niagara Falls, for 68% off. Four Points by Sheraton Niagara Falls Fallsview in Niagara Falls, Ont. So it is not even in the United States. That does not matter if the goal of the visitor is to go over the falls in a barrel or tire.