Sears offers this Ultra Plus Powder Laundry Detergent 180-Load Box (17.3 lbs.), model no. SEA 9879, for $9.99. Choose in-store pickup to dodge the $17.62 shipping charge. That's $0.06/load, tied with our April mention, and the lowest total price we could find. This detergent is rated for high efficiency use in all washer types.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.