Definitely try the Que Pasa red tortilla chips. Their chips are organic, tasty, crispy and not greasy or salty. They should be fairly widely available - I know Fiesta Farms on Christie north of Bloor also stocks them.
I agree - these are great. They are also available at St. Lawrence Market, at the Saturday morning north/farmers' market (there's a guy with a range of salsas who stocks them). Or, if the west end is convenient, Qi Natural Foods on Roncesvalles has them.
Dominion also has Neal Brothers which is also Organic - smaller bag than Que Pasa and a firmer chip, depending on what you are doing with them. For dipping in guac I prefer them, though I like the taste of Que Pasa better.