I loved this deal when it was available during the Black Friday sale, and it is back this week. And according to the coupon database at We Use Coupons, there is a UPromise coupon for $1 savings. Regular price these are $6.39, so one transactions of 3 would look like this:
Buy 1@ $6.37
Get 2 free
Use $1 UPromise Q
Pay $5.37 for 3 or $1.79 per bottle
Without the Upromise coupon, it would break down to about $2.12 a bottle.