I always check out the promotional flyers that I get with my rekord or stuffed into my gate...often things are on sale a whole lot cheaper at certain places, so then I stock up on it if it is something we use, and if I have the money.
and woolies is not so expensive compared to other shops anymore. I rather buy their mince, as it is not so fatty as the ones in the other shops. Also, their ice-cream is the cheapest than those in any other shop. (R29 for 2l soft scoop, and it is very nice). I also only buy lettuce at woolies (R1-2 price difference), but at least it is not wilted by the next day!