If your looking for Chinese buffets, the two main ones I know are
Le Mandarin Buffet Chinois
7373, boul. Langelier corner Jean-Talon
Montreal, Québec, H1S 1V7
and
Buffet Chinois Fu Lam
3500, boul. de la cote-Vertu
Montreal, Québec, H4R 1P8
Other Fu Lam locations