$75 and $100 for a family of 3? What are you people eating? I try to budget for groceries (including cleaning products and toiletries) of around $70 a week for one person but always go over, is probably closer to $100 when I include all the bits and pieces I buy during the week, and I don't eat all that extravagent (not a big meat eater, except for salmon fillets which can cost a bit though). I admit I'm not that stingy when it comes to supermarket shopping though. I can't stand most home brand products and I always buy Australian products where possible, no matter how much more it might cost. And I will always pay extra for free range eggs and chicken.
Considering my paycheque is only $420 a week take home, I think $75 a week is reasonable for 2 1/2 people. Son only eats supper with us.
Almost all of our food is 1/2 price, reduced, or on sale.We tend to know where the cheap food is.We never feel disadvantaged.We wear it like a badge of honor.Not sure how much you all spend on cleaning supplies, but $10 a month would be normal for us.Having a $1 store is great.

If something is not n sale, and we want it, we buy it.
Life and groceries are only as expensive as you want them to be.
One of our cheapest take out meals is 2 hotdogs, 2 coffees, and 2 mini mint patties for a total of $1.96.Yes, I could make it cheaper at home, but sometimes we like to splurge....
Last year in Sydney while looking for a cheap place to eat...and having no luck..we went to Coles and bought a cooked chicken,salad, and chili sauce.Sat in a park aka parking lot and shared with the pigeons.