goto montreal public website: http://english.montrealplus.ca/
click on 'bars and resturants', you will find the different styles of resturants there. as for buffet, you can search 'buffet' or 'vichy' or 'stanza' or 'new port'. I gave you the order i prefer. You can find their address, telephone, map. good luck
There's a place where you pay 6.85 for western style buffet (brunch), however, I don't remember the name of the resturaunt. Anyway, don't try Chinese buffet here if you are Chinese, you won't like it. Better off try some noodles, fried rice instead.