This site lists its lowest per-bottle price directly: $37/bottle on the 6-bottle, 180-day supply package.
6 Bottles at $37/bottle, totaling $222, with free US shipping and all 6 bonus guides — the lowest per-bottle figure across this site's three listed packages.
Worth comparing this against the 2-bottle package's $79/bottle price plus shipping — a meaningful per-bottle difference worth factoring into your decision alongside how much supply you actually want to commit to.