Every couple of months I go to Costco which has opened here in Melbourne.
I buy things like toilet paper, diced tomatoes, nappies, wipes, paper towel, glad wrap, and other things that come in bulk.
They then don't come into my weekly shop, it saves quite alot!
I buy my washing powder from Big W in 9kg lots, it's usually on special by the time I come round to needing it again