Over the last couple of months we have been on a pretty tight shopping budget - i shop for 5 (eldest eats more than i do so in effect 3 adults and 2 kids) and have managed to get our bill down to about $200 a week (give or take).
To give you an idea of what that gets us:
We eat a good quality balanced diet with a family meal every evening and lots of fruit and veg.
Generally cant afford a roast on sundays - but still manage beef steaks once a week. Meat in general is cheaper over here (tho chicken is quite expensive) tho i dont by any means buy the more expensive cuts! I buy meat in bulk and freeze - plus look for what is on special.
I avoid anything that falls into the 'ready meal' category - including jars of sauce (e.g. curry or sweet and sour) these are really expensive - $3.80 for the cheap end of the market. I have started recipe collecting instead and make most things from scratch.
I find cereal here very expensive (tho i appreciate the price of cereal is currently going up everywhere) so we generally stick to the basics - cornflakes, rice crispies, weetabix .
If you buy fruit and veg that is in season i find it considerably cheaper than in the uk so we actually eat more here than we did there.
I bake most of our bread - having a breadmaker is fab and makes a loaf for about half the price of one in the supermarket (and it taste much nicer)
I buy extras of our 'standard' things when they are on special - over time this cuts down weekly bills.
I think it is the lunch box extras (crisps etc) that add the most to the shopping here (well anywhere really!). I have started having a baking afternoon on sunday and making batchs of things for lunch boxes during the week - homemade cheese straws instead of crisps are much cheaper, healthier and the kids actually prefer them!
Cant think of anything else for now ... if i do i will pop back :)