For me, the best thing to do is just figure out who has the best prices on basics, and just shop there. Here, it used to be wal-mart, and technically it still is, but Kroger recently lowered their prices, it seems, so I go there now.
Things like eggs, milk, bread, meat, produce ect are always fairly low at either store, but I like kroger's selection better so I go there usually. I don't often find what I want in the ads, but let's face it, they aren't going to advertise low prices on basic foods. They want you in to get the name brand stuff. They do sales to draw you in. If you are already shopping frugally, there's really no point in reading the ads unless you need a lot of stuff for a bbq or christmas dinner or something.
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