I quit shopping sales for a while. I took it for granted that Aldi had the best prices and pretty much shopped there exclusively for a while. I started adding on another local store when I realized I couldn't get everything I wanted at Aldi. I still went with my meal plan and shopped around it. The problem is that it is hard to take advantage of sales if I have a strict shopping list. I don't get the paper, which means I don't get ads and never knew what was on sale.
My solution: Sunday Saver Most of the ads I will ever need are available online. I can now plan around what is on sale before I leave my house. I already know what Aldi's regular prices are so if I find a better deal I can get things elsewhere. I also keep an eye on price changes. For example, I used to buy 8oz blocks of cheese at Aldi for $1.49. Last time I went, the price had risen to $1.79. With that info, it is no longer cost efficient to buy cheese at Aldi since I can regularly find it on sale for $1.50. Would I drive out of my way for $0.29? No. However, since I usually have to make 2 stops anyway, might as well maximize where I can.