I just went the Buffet Dragon in Gatineau this morning, the lunch buffet was quite good. Highly recommend it! Lots of choices - dim sums are very fresh, price is lower than those in Ottawa.
You can either take Alexandra Bridge or MacDonald Carrier Bridge, then follow highway No 50 and exit on Boul. Maloney. The restaurant is located in a mall near the intersection of Boul. Greber and Boul. Maloney Ouest... You will not miss it.