This site states this specific detail directly on its 2-bottle pricing card: shipping charged separately.
Worth factoring this into your real cost comparison — the $158 total shown for 2 bottles doesn't include the additional shipping charge that applies specifically to that smallest tier.
This site separately states the 3- and 6-bottle tiers both include free US shipping — worth reading this 2-bottle-specific detail as the one exception to that broader free-shipping pattern.
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