We stumbled upon this little gem after attending a meeting nearby - it was totally by chance! Being from California I have been looking for a Mexican Market with some authentic ethnic ingredients and that's exactly what we found!
I really wanted my Tajin to season fresh fruits with and they actually carried it!
While browsing the shop, we found they have a fantastic fresh Mexican food business that is primarily for lunch, but you could pick it up to take home for dinner too! The day we were there she was serving Mexican Salad, Tortilla Soup and other specialties.
We decided to take and heat some items from their freezer - tamales, black beans, spicy salsa and homemade tortilla chips. We were very impressed with the homemade flavor and the care to create something that tasted better than anything we've had in a Mexican Restaurant here in Calgary - period.
Now we compare all the restaurants we go to with this place, and by far TresMarias wins.
If you follow their twitter, you can be up to date with whatever fresh items they are preparing that day:
https://twitter.com/TresMarias_Mex