The 2-bottle bundle shows a struck-through total of $358 beside a current $158. The gap looks large, so it is worth working out what it really compares.
$358 divided by two bottles is $179 each. The same page lists a regular price of $79 per bottle, and two bottles at $79 come to exactly $158. So at the 2-bottle level you pay the regular price per bottle, and the 'saving' is only against the $179 reference figure.
Shipping adds $9.99 on this bundle, for a total of $167.99. Over the stated 60-day supply that works out to about $2.80 a day. That is our arithmetic using the page's own figures, not a price the brand quotes.
Treat the struck-through figure as a reference, not as proof of a former selling price. Anchor on what you actually pay, including shipping, and confirm the final total at checkout, since offers can change.