This site labels its two larger packages differently — "Best Value" on 6 bottles, "Good Value" on 3 bottles — worth understanding what differentiates the two.
"Best Value" is tied to the 6-bottle package's lowest per-bottle cost of $49 with free shipping; "Good Value" is tied to the 3-bottle package's $69/bottle, a middle tier also including free shipping.
Worth noting the 2-bottle package, the only tier without free shipping, carries no value label at all — worth reading that absence as consistent with the package's higher per-bottle and per-day cost.