We spend about $200 per week 2A 3C sometimes $250. Because we have a local farmers market we eat pretty much organic and local fruit and veg. I go to coles once a month and stock up on organic items and cheeses. Plus we are part of a co-op which allows us to eat organic or biodynamic flours, nuts, grains and pulses cheaper then conventional. Have you got some friends that you could start a co-op with??? Do you have local farmers markets or one close by? Buying in bulk or shopping once a month means you spend less on things you really don't need. Once we are out of something we have to wait out the next market, order or shop!! THis saves alot of money, as spot shopping you buy bits and pieces that you don't really need.
We are veggo, but when we ate meat, whole chickens were the best value for money as you can make so many dishes from one bird. A free range chicken is only about 9-12 bucks!!!
I agree with garden in some pots, even just lettuce and tomatoes a few herbs saves you heaps and you always have something for lunchboxes. Plus, sprouting in jars is fun and tasty. Making your own spreads like hommus, pesto, olive tapenade etc helps with fresh lunch ideas!