Amazon cuts $2 off select 100-oz. bottle 4-packs of Tide products (a total of 400 oz.) when you clip the coupon on the product page. Subscribe & Save cuts an additional 15% off and bags free shipping. That's the best deal we've seen on these items from Amazon.

A best bet is the Tide Total Care HE Liquid Renewing Rain Scent 100-oz. Bottle 4-Pack (pictured) for $38.70 with free shipping after you clip the coupon and buy it via Subscribe & Save. That's $9.68 per bottle, $0.10/oz., and the lowest total price we could find for this quantity by $10.

Be sure to cancel Subscribe & Save once your order ships to avoid being billed for subsequent shipments.