What is the full ingredient list?

Am I reading the price an amount in the bottle incorrectly? Because it looks to me as though if I buy 2 .5 ounces.(15ml) each I would be getting 1 ounce (30ml) for $78. Yet if I buy 1 of the regular size it’s 1 ounce (30ml) but I pay $99. That doesn’t make any sense who would ever buy the larger one. It’s $21 savings to buy two smaller ones … I’m missing something???