Today only, Banana Republic takes an extra 50% off sale items. (Discount applies automatically in-cart. Click the "sale" banner to see these items.) Shipping adds $7, but orders of $50 or more receive free shipping. That's tied with last week's mention as the best extra discount on sale items we've seen from Banana Republic this year. Some exclusions may apply.
If you aren't using any of these three methods for significantly saving on laundry detergent, you are washing money down the drain.