A couple other tips:
If you have a discount grocery store in your area, like Save-a-Lot, Price-Rite or Aldi, shop there. If we cut back on junk food and impulse purchases, we can buy most of the week's groceries at Save-a-Lot for under $60. That's for 3 adults. Cat food is extra because I don't buy the cheap generics (but I usually buy it at PetSmart because it's cheaper than the supermarkets).
Check dollar stores. The Dollar General here has a lot of grocery items. Things like ketchup, spaghetti sauce, pasta, bread, cereal, cookies....for less than the regular supermarket chains. Their dairy stuff is pricey so I buy that at Save-a-Lot or Aldi (Aldi has the cheapest price on dairy in this area).
Check the store websites. Some of them have printable coupons every week for their store.
Shop from a list and stick to the list. I save the most money when I strictly follow the list and ignore all the tempting extra goodies that I don't really need. The more fancy extras in a store--in-store bakery, coffee & donuts to go, snack bar, etc--the more expensive that store usually is (Wegmans has a lot of great stuff but they are very expensive).
All witches are bit odd. It's best to get your oddness sorted out early. (Terry Pratchett)---
Nothing grows in Midgar.