This site displays this specific phrase directly alongside its pricing: "Buy 4 Get 4 Free" — worth understanding how this framing maps to the site's actual listed bundle sizes.
This phrase describes the effective value of the 8-bottle-equivalent 6-bottle "Best Value" package at $37/bottle — worth checking the actual per-bottle price and total cost listed for each tier rather than the framing phrase alone.
Worth comparing the three listed bundle totals directly — $158 for 2 bottles, $222 for 6 bottles, $177 for 3 bottles — rather than relying on a promotional phrase to understand the actual value.