The co-op is a wonderful source for most of your food basics - it sells almost all dry goods in bulk: flours (of all kinds), grains (rice, barley, millet, quinoa, polenta, etc), nuts, seeds, cereals, spices, dried fruit, oils, ,sauces, miso, maple syrup, etc... Plus it has a good range of fresh local fruit & veggies, tempeh, organic butter, cheeses and goats milk in the fridge and little extras like baked goods and Cocolo fair trade, organic chocolate.
They also make sure that the food is ethically sources - low packaging, organic, local, rain-fed rice, etc...
The prices are very reasonable (since it is not-for-profit) and as a working member you get a 20% discount, which is pretty significant.
It is a lovely place to shop. There's a kid's corner with toys, somewhere to sit and have a coffee, and friendly volunteers behind the counter. I can't recommend it highly enough!
Cons: smaller range than supermarket