Amazon.com
has 60-count Cascade ActionPacs Dishwasher Detergent for $12.97 - 15% off Subscribe & Save - clip $1.00 coupon on product page located just below the subscribe and save (you may need to log in your account to see the coupon) = $10.02 with free shipping for $25+ orders.
Note: you may cancel your subscribe & save subscription any time after your order ships.