The Coupon Expires 11/02/17, The Expiration date may depend on when you print it. The print limit is two. The coupon states limit of one identical coupon per shopping trip.
Kroger has 18 oz Purex Crystals on sale for $3.49 through 11/01. Buy three for $6.98 or $2.32 each after the Buy two Get one Free Kroger Digital coupon below
Walmart sells the 18oz for $2.97. Buy three for $8.91. Use the Buy two get one free coupon above and pay $5.94 for three or $1.98 each.
The 18oz is $3.50 at the Dollar General. $2.33 each when you buy three and use the buy two get one free coupon above.