"Shoulda went to Costco," huh? No kidding. Perhaps Costco is having a sale on proper grammar.
??? Even at Costco -- or Wally World....
Case in point --- (appx. prices are at Wally World) - a gallon of milk around here is appx. $4 and a box of family sized Cheerios is about $5 and a carton of eggs is about $3.80. Bread is about $2.50, a gallon of OJ is around $8. That comes out to about $20 and change and with 6 kids that'll probably last about 2 days for breakfast - one day cereal, one day, eggs and toast -- so with that on the menu for 7 days you're looking at around $60.00+. You could switch out bananas or some other fruit for the OJ -- but with 6 kids -- that's about $240 to feed six kids breakfast for the month. Lunch and dinner....would be even more expensive.
Not everybody has the land for a garden, especially to feed six, nor do many have the luxury to hunt for their own food or fish and Dad probably doesn't have the time to make everything from scratch because he works.
I know of a family of six (4 kids 2 adults) and their bill is similar, in fact things have gotten so ridiculous they are applying for food stamps. Both of them work and make good money. -- They have a triple fenced lot and they have put in raised garden beds that provides them with fresh lettuce, tomatoes, watermelon, squash, peppers and I don't remember what else but that cuts their produce bill. What about milk, eggs, meat, bread?? They cook fresh -- kids aren't allowed, cookies, chips, or ice cream except on special occasions -- they can't afford it anyways.