Today I go supermarket, and buy a few packs of 3 in 1 Milo energy drink.
You are right to think that it is cheaper to buy a big tin of Milo powder, and make the Milo energy drink at home.
The problem is that we do not drink Milo every day.
When you keep Milo for a long time, you will find that the Milo powder harden into a big piece.
You have to throw away the unused Milo once it hardens.
That is why we prefer to have 3 in 1 Milo which is individually packed. It is possible to keep the individually pack of 3 in 1 Milo energy drink powder for a few months.
In this case, we reduce wastage, even though the cost is higher. To reduce cost further, we buy only when there is a sale that reduces the price by 10% or more.
In most cases, we get the items on 20% discount. It is cheaper in this way.