Buying in bulk when items are on sale and then cooking and freezing in a big chest freezer is how I do it too. I shop at Superstore using PC Points which saves me hundreds annually. I also have an app on my phone called flipp where I can price match every flyer available which is usually a lot more than what comes through with the paper each week. I personally think $150 per week for all unprocessed foods is really good. That's only $30 a day/ $6 per child and although reducing costs is always a good thing, I'd be worried that aside from price matching and buying only items that are on sale the only way to reduce that expense would be to serve more processed/convenience food which to me would be a shame.