I shop regularly at the Carrillo Ralph's grocery store here in Santa Barbara. I'm a retired nurse and the caregiver for my retired and ailing husband.
Multiple times, I have been charged a different price at the check stand than the shelf price. I am asked, "Are you sure this isn't an e-coupon price?" No, it isn't. And I show them the price on the shelf.
They give me my money, and when I've complained to the manager and the district manager, they throw a couple of $5 coupons my way and say thank you.