Tide Free & Gentle High Efficiency Laundry Detergent, 75-Ounce (4-Pack) for $29.55 shipped after selecting Subscribe & Save to take an additional 15% off and receive free shipping. Here is a screenshot for reference. You can cancel Subscribe & Save with a few quick clicks with no obligations after your order ships. This laundry detergent is specially designed for sensitive skin and made with no dyes or perfumes. This works out to be just about $0.10 per ounce.