Amazon has the 37oz Tide 24-Load Hygienic Clean Heavy 10X Duty Laundry Detergent Liquid Soap for $5.49. Change quantity to 4 to reach $22 - 5% off with Subscribe & Save (can cancel at any time) - $5 multibuy discount - $1 "Buy any 4, Save 5%" discount = $15 with free shipping on $25+ or with Prime.