[cdubzzz]

Yes, that's very true. Even in brick and mortar stores, single manufacturers may provide multiple types and the retails often provide confusing information for comparing them. E.g. an 18 oz. Aveeno bottle with a price tag that shows $0.42/oz and a two-pack of the same bottle that shows 7.99/unit - and then perhaps a "SALE" tag attached that displays a different overall price and no further information.