I stick mainly to whole foods (chicken, dairy, etc. which I get at Cosco, and veggies), but my favourite treat is the Breyer's chocolate low-carb ice cream. I've found it for the best price at Loblaw's, but they are often out of stock lately -- hope they aren't phasing it out! IGA also carries the ice cream, but it is 1$ more per carton.

Teva on Decarie boul (the east side at Queen Mary Rd.) has a lot of options as well, although I don't buy things regularly. One of the people at Teva (Steven) follows Paleo, so he knows quite a bit about low carb, he used to tell me all the time when I was on WW that I should be eating low carb, not low fat/high carb

Other than that, if I feel the need for an Advantage bar, I get them at Maxi because they are 3/5$ which is the most reasonable I've seen.

Loblaw's also has a lot of prepackaged low-carb foods (like frozen entrees), but I personally stay away from anything like that.