Powerbars: Buy one, get one free at Costco

Just got my Costco coupons that are good from 8/17-9/06 and noticed they have a coupon for buy one, get one free boxes of Powerbars.  I bought these a few months ago and they come in a package of 2 boxes (12 in each box) with Peanut butter and Chocolate.  I guess the flavors may vary depending on your store, but that is what they had at mine.

I don't work at Costco or anything, just trying to pass along a good deal to those that I know eat them.
-Nick