Jet.com has got Tide Simply Clean & Sensitive Liquid Laundry Detergent, Cool Cotton, 100 oz, (48 Loads) priced at $5.99 (which is a terrific price on it's own), but when you create a new customer account at Jet and enter promo code TRIPLE15 at checkout, that price drops by 15%.
Now in order to use this promo code (and to score free shipping) you must have at least $35 worth in your shopping cart, so add 6 of these 100 oz. Tides to your cart and your total will be $29.16, or $4.86 per 100 oz. bottle. You get additional savings the more you add to your cart.
You can get the same deal with Tide Simply Clean & Fresh Liquid Laundry Detergent.
If you're new to saving money on Jet, you can read the Primer on the best saving strategies for Jet deals over here.