buy in bulk
Within limits. Buying a 20kg bag of potatoes may be less per unit than a 5kg one, but if half of it spoils before it gets used then the 5kg one is better. Similarly, bulk chips may be cheaper to buy, but eating a family size bag of chips by yourself because you haven't been taught to portion control is worse than buying pre-portioned snack size bags. And then there's also the FOMO marketing tricks: "two for one discount, limited time offer!" Do you really need two? Would you have bought even one, if it hadn't been "on sale"?
