Ive seen this in the UK Aus and NZ but never in the US. I wonder if it is because US stores stick to a perhaps rational strategy where discounted items cannibalize profits?
It's in the US too however it's in lower cost areas. For example, a small rural town in Wisconsin has a bargain store that often gets these kinds of items from Costco and major markets like NYC and Chicago (it's obvious by the ethnic grocery items). Obviously, one small store isn't enough to sell it all so there must be quite a few of these spread out over the country in lower cost of living areas where rent is cheap for low margin small retail.
In the US we have discount "grocery stores" in lower income neighborhoods that pretty much exclusively sell stuff that is past or very close to it's best by date. I agree it's less common to see a discount bin in a normal grocery store, but if you're in a more working class neighborhood you might find a rack that has stuff that they're not longer stocking, old bread, or dented boxes and cans.
In the US (at least in some states) there are discount grocery stores that buy truckloads of expired products from the major retailers and sell them off cheap. Tend to exist in lower income areas.
Some of the stuff is years out of date. A surprising percentage of people don't even look at the date.