Enjoy significant savings on a 15-count variety pack of Bai Antioxidant Drinks at Costco! A 15-pack is regularly $19.99, but after a $4.00 instant savings discount, the price drops to $15.99. That’s $1.07 per bottle and a significant savings over the price at other stores. The next best price we found was at Amazon where a 12-pack of Bai sells for $18.99. That equates to $1.58 each. Costco is definitely the better value!