In business it is usually all about volume to get a better price break. I would assume, as business people, you could get a better price break if you bought huge quantities from your supplier.
I wonder is this true with gasoline? Does the Walmart Supercenter gasoline station get a better price break say than the corner gas station because Walmart has bigger tanks and sells more and is backed by Walmart? Or regionally does everyone get the same wholesale price? Hence the need for the corner station to be higher than the big boys?