Amazon has 100oz Tide HE Liquid Laundry Detergent (Original) for $8.37 when you ‘clip’ the $3 off coupon located on the product page and checkout via Subscribe & Save (select the later date from the "First Delivery On" menu). Shipping is free.
Note, must be logged in to clip coupon; coupons are typically limited to one per account. You may cancel Subscribe & Save any time after your order ships. Available to ship in 1-2 days.