Amazon has the 55oz Arm & Hammer Super Washing Soda Laundry Detergent Booster & Household Cleaner for $5.38 - 25% off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel at any time) = $3.76 with free shipping on $35+ or with Prime.