It just occured to me that there is no post about the Mangez Ici card on this site... I've had one for the past 2 years, and save more than the card's worth every year so I find it useful.
I bought it for 10$ again this year, and get 15% off in a hundred restaurants in Montreal until the end of December. The list is available on the web site http://mangezici.com/ (French only).
The Exploratours counter at the Peel infotouriste center has them, otherwise you can buy it online. I see on the website that there is now a 2 months card for 4$, a 2 year card for 10$ and a lifetime one for 40$.
You present it while ordering. I've never had any problem, even if the waiter is unfamiliar with the card. Someone else in the place can always confirm the rebate!
Thought it would be nice to share this. The more people use it, the more other restaurants will join in ...