Where?
Rural Central Pennsylvania.
There are many large food surplus stores that you never know what they might have. I put a large freezer in the back of my truck in the summer when I go there. Winter, it depends upon weather.
Many of these are Amish/Mennonite. I buy bulk. 50 lb bags of flaked oats,flour, popcorn, salt, sugar, beans, ..
I just purchased last week, Land of Lakes butter by the small cases $9.99 for 6 lbs. (Unsalted) in 1/2 lb boxes. I freeze it.
They also have out of date items.
I purchased Progresso canned Soups, Lentils, with a December 22 expiration date for 99 cents for a case of 12. That’s for the entire case, not per can.
There are at least 6 of these stores. Plus, in the summer there are three large wholesale produce auctions where the farmers sell their crops. (The Amish & Mennonite are produce farmers)