Totally agree with you there. Shop around, check all the catalogues for what's on sale and buy in bulk if necessary. (Eg: The coffee I drink has gone up to $44 per kg. It was on sale the other week at half price. So I grabbed 2. Bingo - instant $44 saving.)
With the Woolies rewards card you rack up the points and get money off your shopping - on top of the 4 c/litre petrol discount. We bank up our "Woolies dollars" and use them to offset grocery or petrol expenses.
There are more perks available if you use the Woolies phone application (and sign up to them) but I'm at risk of sounding like free advertising for the swine.
Also - check Aldi as well. Pretty much the same stuff as Coleworths but with different branding and lower prices.
Cheers,
V