You give us some great ideas. It sounds like it is worth the extra effort to do those things (tracking the store prices, and checking Amazon).
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You’ll not save major bucks by shopping around, but every little bit helps, especially now.
I’ve started doing a fair amount of my grocery shopping on-line. Sometimes I have to up the quantity to get free shipping but, it’s food, it will get eaten eventually. Plus there’s no sales tax and the product is delivered to the front door.