Kmart offers this Ultra Plus Powder Laundry Detergent 180-Load Box (17.3 lbs.) for $11.99. Choose in-store pickup to dodge the $17.62 shipping charge. That's $0.06 per load, $12 off, and the lowest 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 Kmart credit with this purchase and may be eligible for additional credits and discounts.