One of the places I've enjoyed going to with family is a little spot near the intersection of Joyce & Kingsway. They have an all-you-can eat Dim Sum brunch for about $10 a person. At that price you can't expect a lot of the exotic items, but if you're patient you still get tripe and such. It gets really busy with a long line up, so I recommend getting there before 10am.
Anybody have any recommendations for similar joints in the Vancouver area?