2 Bottles, $158 Plus Shipping: The Pricing, Explained

This site lists this specific two-bottle figure directly: $79/bottle, total $358 struck through to $158, plus $9.99 US shipping.

What this specific tier includes

2 Bottles at $79/bottle, a 60-day supply, labeled "Best offer: biggest discount" — worth noting this tier carries its own distinct label, separate from the "Most Popular" label on the 3-bottle tier.

Why this is the only tier with a separate shipping charge

Worth factoring in the additional $9.99 US shipping charge specific to this 2-bottle tier — the 3- and 6-bottle tiers both include free US shipping, per this site's own pricing breakdown.