Well, I occasionally will see a deal too good to pass up. Last month I bought individually packaged cheese doodles for way cheaper than I could have gotten them anywhere else. I often buy candy bars, gum, and such items there as well.
But, this said, just be careful about what you're buying. Read the lables and look at experation dates. If it is expired, skip it. If the label is in something besides english or has tons of mis-spellings, skip it (it could be from another less regulated country and isn't worth the risk).
Oh, and for the record, I only buy brand names. My son has food allergies so I am very particular about what I purchase. Our Dollar General around here have tons of name brand foods.