Our normal day would have involved breakfast at home, lunch at school/work, and dinner at a fast food restaurant. We would have spent at least $15 on dinner.
Instead . . .
Breakfast at home -- around $1.00
Lunch at school/work -- no out of pocket costs
Dinner at home -- around $3.50
Total spent on today's groceries: $4.50, plus a trivial amount on snacks.
Saved at least $10.50 today, totalling over $35 this month already!