Home brand EVERYTHING.
But make sure to check out specials too - sometimes toilet paper, etc can be cheaper when on sale than the homebrand.

Is there a bulk meat supplier that you can find in your area. Yes mince is cheap, but you can get bulk pieces of the better cuts for cheap at bulk suppliers. I often buy a whole rump - so that's anywhere from $35-50 depending on the size (at about $8/kg). They will slice for free and I will get them to leave 1/4 at the end in a piece. This can be cubed or minced (in a food processor), or used for a roast (roast can last for lots of follow up meals too). Often mince is dearer than mincing some of a better bulk cut.
Bulk chicken can be about $6/kg too nd of course you can get really cheap sausages (though not too healthy) at these places too - $2/kg usually which would be fine for once/twice aweek.

Of course this will depend on when you can get that freezer.