"Bookperk is a site for all of us book lovers. For the first time, readers get access to exclusive merchandise and experiences from their favorite authors and books."
It's a site run by HarperCollins to give added value to the book experience. They have offers for books + other things, like movie passes and lipgloss. The deals work like Groupon in that if not enough people are interested, no one gets it.
They currently don't offer deals outside the US, with one exception. They're running a contest that's only open to Canadians honouring Lindsey Kelk's The Single Girl's To Do List (alas, as an employee of Indigo I can't enter).
Here's the link to the contest and to the terms and conditions. Contest ends September 1st.