Infant formula and general online shopping

Hi,
I'm headed back to Canada to show off my first born and was curious to know which major brands of formula (powder) is available there these days. I left canada for the uk so long ago that I don't even know which online sites could give me some indication.
Tesco/Sainsbury/etc are good examples in the UK of what I'm after . do Loblaws/Provigo/etc have online sites (can't find their proper online shopping sites).

Thanks for any help
Mike
P.S. In the UK we are currently using Aptamil which is what I'd like to continue to use in Canada . if I can get it.