The first time I tracked my spending, over $3,000 was associated with the grocery store, but we were using the POS as our ATM for cash back. Actual groceries were about $2,000. I'll sometimes test to see what I can buy with $80, and how long I can make it last, like if I buy cheaper chicken, potatoes and frozen peas for a dinner, then sausage, rice and carrots for another, etc. But my usual dinners consist of a meat with 4 fruits and vegetables, and since this is so commonly served, I try to make sure there is a good sense of variety, which sometimes includes produce that is out of season.
We buy a lot of fruits, vegetables and meat for 6 people, and I can easily be cooking for 10 twice a week with the girls having friends over. For 9 days around Thanksgiving, we had 3 relatives staying with us. I have one gluten-free kid, so some of those products are pricey, too, but they are generally snack foods since almost all of my cooking is gluten free anyway. And there are plenty of cheap G-free snacks, like popcorn and corn-based tortilla chips.
Milk is $5.49 for a half-gallon (grass fed) but sometimes I get the organic gallon if there's not whole milk available in the other.
The shampoo and conditioner we use are $20 each, but I'll sometimes buy the $6 Tresemme.