My town only has 3 major grocery stores now. One of them is typically high priced. This spring, however, they have been selling their store brand Columbian 34-oz for under $7. Just a couple of years ago, they were selling the same for nearly $14.
I have been stocking up by getting a can each time I go to that store, which is once or twice per month.
Walmart has been selling their large store brand can of Columbian for just under $7, but their can is the 27-oz size.
If you have a dented can store in your area check it out, that is where I get most of my espresso. They generally have both cans and vacuum packs of the latin brands(Cafe Bustelo, Pilon, etc) these are stronger than European brands. On rare occasions I have found Illy and Lavazza (italian). As long as they are still vacuum sealed they are good, I have had Italian espresso many years after expiring, I could not tell any difference.