There are products that are in packages, but milk, eggs and many other things are sold per unit.
If you can buy only one milk
There are a variety of options but you can buy just one milk
yes it can be bought
They have options but you can definitely buy 1 milk
There are many things wholesale, but the vast majority is retail
Most things in bulk but milk you can buy only one
If you can just buy a milk, a bread, etc.
Only wholesale but in any case, you can buy three jars or cans of milk.
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