Anecdata from where I live in Georgia, on the same day with the same products:
| Product | Grocery Store A | Grocery Store B |
|---|---|---|
| Dumplings | $6.59 | $6.49 sticker, $4.99 with digital coupon |
| Oatmeal | $6.99 | $5.99 sticker, $3.99 with digital coupon |
| Almonds | $11.50 | $10.49 sticker, on sale for $8.50 |
| Soup | $4.45 | $3.99 |
Lesson: comparing prices saved me an average of $2 per item!