I keep track of all of my purchases in a spreadsheet which also tabulates monthly and year-to-date totals. Here is a screenshot, showing the February #s for Walgreens, Target, CVS, Kroger, HEB, WalMart, and Randalls. Keep in mind that we went on a cruise for a week, which means one less week of grocery shopping.
Retail price: $1169.39
Saved: $1,086.23 or 93%