I can’t get everything from Aldi’s, but I get alot. My shopping routine looks like this:
Once a month:
Costco- meat, household goods, cheese, cereals, beverages (water, wine, etc)
Once a week:
Aldi’s- breads, yogurt, milk, snack foods, frozen goods, tinned goods, spa treats (Lacura FTW!)
Once every couple days:
Local grocery, ten minute walk: Fresh fruits and veg, occasional milk top-up or quality fresh baked goods
I find this gives me the best combo of price and quality, without having to pore over ads and clip coupons a couple hours a week (which I used to do).
If you able to do it and you have the patience for it, and do things right... yes... you can save money and do a very good job of it.