LOWEST PRICE: 2-count 100 oz. Earth Friendly Products ECOS Detergent for $9.79 (just about half-price). Limit 3 per account.

Amazon has got this 2-count of ECOS Lavender Hypo-Allergenic 100 oz. laundry detergents for $9.79 (limit 3 per account), the lowest recorded Amazon price on this item. My stock-up price on laundry detergent is about 10 cents per ounce; this deal is slightly under 5 cents per ounce.  The average Amazon price on this item is somewhere just north of $22.  This is a steal!

While this is a "green," plant-based product, it got great reviews for its cleaning properties, and an overall 4.3 out of 5 stars over 261 customer reviews.  It's also an "Amazon's Choice" item.  (I'm not the greenest person in the world when it comes to cleanser brand preferences, but the combination of the great price and the stellar reviews won me over.)

This is an Amazon Add-On item, which means that it ships for free with a $25 minimum order (and its price counts towards that $25).  You can buy multiples of this item to help get you to your $25 minimum for free shipping.  (Other Amazon Add-On item deals can be found here.)