The biggest saving for us has been from buying a deep freezer and buying all our meat in bulk.

We were buying it as we needed it from the supermarket (disorganisation mainly lol) and it was costing us a fortune. I was seriously starting to cut back the amount of meat we were eating.

Bit the bullet a couple of weeks ago and went and bought bulk again - for $130 we got:

A whole rump - sliced free by lovely butcher (about 6kg) - $8.99 kg...sure beats paying $21/kg at the supermarket for a few slices.
A side of lamb
2kg of mince
2kg chicken breasts
1kg chicken thighs
1kg bacon.

This will last us for a couple of months.
Seriously it's the only way to do it. The initial outlay is higher but you just save bucketloads.
And we're eating much better too.