The produce and grocery market on the ground floor of my apartment building sells stuff that’s so out of date, it’s funny.
A week ago, I was in a pinch for some dishwasher detergent, so I go there. Near the detergent, they had a bottle of Future acrylic floor finish that was about 14 years old. The stuff had aged from its original water-clearness to a pale amber. How did I know it was old? In the bottle was a coupon (printed on a slender strip of plastic that will pour out of the bottle so you’ll have it to buy the next bottle) with a 1989 expiration date.
In terms of food, they often have stuff that’s at least a couple months past the last sale date.