The price is clear. The value is harder to verify.
By our arithmetic from the page's prices and supply labels, the cost is about $2.63 a day before shipping on the 2-bottle package, about $2.30 on the 3-bottle package and about $1.63 on the 6-bottle package, assuming you finish the supply.
Whether you can verify the ingredient list, whether the refund terms are clear and whether you will log honestly for 60 days. The conflicting reference prices are a reason to ignore them and judge by the actual price. A product you cannot read the label of is hard to rate at any price.