La Tortilleria has a fantastic range of import Mexican groceries - canned goods, dried chillies, sauces, beans, desserts, snacks & drinks. Just as good as any of the little Mexican marts in Kensington Market, really - but much more handy if you don't want to head downtown.
Also on offer are the fresh salsas, tortillas & chips that other reviews talk about - while i've not purchased them, they are dead cheap and i've been meaning to try them for a while.
Prices for the whole store apart from that are pretty reasonable considering the import nature of most of the goods. Easy to get to from Dufferin Station, handy to waddle back laden down with bags of delicious groceries!