I am planning to visit my family back in Mumbai after couple of years. I am looking at cheap flights deals and found good prices at http://www.FlyLink.ca site. My tentative dates are in March break when kid’s schools are closed.

Does anyone know better prices on any other site?

I think travel oracle is right that most prices tend to be pretty close, even for a trip somewhere as far as Mumbai.
What I like to do is tell people to run a few searches on a few days and see which dates have the cheapest flights, since the variation in day-to-day prices can be pretty big.
I always end up going back to Flylink for that because their interface is so quick to run searches on compared to the rest that make me jump back and forth between pages.