Here are some of my favorites from back in the day:
Stouffer's Macaroni and Cheese- Unbelievably good frozen macaroni and cheese. So good, that when The Barefoot Contessa's recipe for Mac 'n Cheese didn't work out as planned at Thanksgiving a couple of years ago, Mom substituted Stouffer's. Everyone loved it (especially me, who knew at bite one what I was eating).
Five Alive- you don't see this much, but it used to be one of my drink boxes. That and Crantastic.
(Diet) Canfield's Chocolate Fudge Soda- I always thought it was pretty gross, but for some reason there always seemed to be a couple cans in the pantry. Maybe because no one ever wanted to drink it.
Freihofer's Chocolate Chip Cookies- Greatest chocolate chip cookies ever. And sadly, very unavailable South of the Mason Dixon line.