Cost per day is the fairest way to compare packages. This is our arithmetic, not a figure from the seller.
2 bottles: $158 divided by 60 days is about $2.63 a day, before shipping. 3 bottles: $177 divided by 90 days is about $1.97. 6 bottles: $294 divided by 180 days is about $1.63.
These rely on the supply labels, since the page gives no serving size.
It ignores tax and the 2-bottle shipping, which are not stated. It assumes you finish the supply. If you stop at day 60, a 6-bottle bundle costs far more per day of use.