For Prime members only, Amazon offers the ECOS 100-oz. 2x Earth-Friendly Liquid Detergent 2-Pack in Magnolia & Lily for $10.88. At checkout, that drops to $9.99. With free shipping, that's tied with our mention from two weeks ago (which required a purchase of $25 or more) and around $9 less than you'd pay in local stores.

Update: It's now due to ship in one to two months.