The Coupon Expires 12/22/17, 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.
18oz Purex Crystals are part of the Kroger Mega sale and are priced at $2.49 when you purchase 4 participating mega sale items throughout the store. Buy three for $4.98 after the Buy Two get one Free coupon above or $1.66 each. No need to purchase 4 Purex Crystals, just 4 participating items. Just be sure and purchase Mega sale items in increments of four to get the mega sale price.
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.