For first time users of Boxed.com only.
1. Amex has $10 back on $50 on Boxed.com [boxed.com]. You can activate this in your Amex online account under Amex offers, or entering #AmexBoxed on Twitter.
2. Also, there are tons of $15 discount referral codes available for Boxed.com (Referrals not allowed on SD, so check RetailMeNo). Shipping is free.
3. Add a filler to hit $65 (such as Sriracha for $2.39)
4 X 15.99 = $63.96 + $2.39 - $15 discount code - $10 Amex credit = $41.35
Works out to less than $0.85 cents per bottle.
Comparatively, Amazon offers 48 bottles (4 x 12) for $71.76, or $1.50 per bottle.