Walmart Savings Catcher is good sometimes too. If you find stray receipts in baskets and such, try them. Not the biggest earner, but if it finds stuff cheaper elsewhere it will give you the difference. I got a quarter 2 weeks ago for a 2 liter of Coke. So it’s worth the time. Just remember you get the difference back in Walmart gift card.
https://savingscatcher.walmart.com/