Grocery prices are usually compared per pack, which is the least useful unit there is. What matters is what a meal costs to put on the table, and that changes the answer more often than people expect.
Work in portions, not packs
A kilogram of mealie meal makes roughly eight portions of sadza. A kilogram of rice makes about ten. Once you divide the pack price by portions, two products that looked close together on the shelf usually are not.
Do the same with oil. A 750 ml bottle and a 5 litre jug rarely cost the same per litre, and the gap is often a third or more.
Where buying bigger stops paying
Bulk is cheaper per kilo until it is wasted. The break-even is honest storage: if you have a sealed container and a dry cupboard, buy the 20 kg bag. If the meal will sit open in a humid kitchen, the saving disappears into what you throw away.
Perishables invert the rule entirely. A five kilo pocket of tomatoes is only good value if you will cook through it in a week.
The cheap items that carry a meal
Onions, tomatoes and a bunch of greens cost very little and are what turn a plate of starch into a meal. In a tight month they are the last things to cut, not the first.
Beans and samp are the other quiet win: slow to cook, cheap per portion, and filling in a way that rice is not.
Buy the season
Produce prices swing more than dry goods, and buying whatever is in season is the closest thing to a discount that does not need a voucher. Citrus in winter, tomatoes and greens through the rains, avocados when the Eastern Highlands crop comes in.
One list, one trip
The most expensive shopping is the unplanned top-up. Write the week down, order it in one go, and the impulse buys never enter the basket.
What is good this week
Seasonal produce, price drops and the odd recipe. One email a week, and one click to stop them.