I go to Price Chopper (low overhead as they don't have a bakery or butcher staff member on) and they have great sales. I spend about $150 every two weeks and maybe a few bucks for milk or bread in between that if we run out.
The best way to save money on groceries is to make out a 2 week meal recipe plan..This way you have everything on hand and generally eat healthier, and don't end up eating quick crap.
Where are you people shopping?
Including basic toiletries (toothpaste, TP etc) we spend about $100 CDN per week including the milk etc we pick up during the week