Amazon offers the Cascade Complete ActionPacs Dishwasher Detergent 78-Pack in Fresh Scent for $8.34 with free shipping via the directions below. That's about $8 less than you could expect to pay in local stores, although we saw it for a buck less last month. To get this deal:
1. View the Cascade Complete ActionPacs Dishwasher Detergent 78-Pack for $12.99
2. Clip the $4 off coupon on the product page
3. Order via Subscribe & Save for a final price of $8.34

Be sure to cancel your subscription after receiving your item to avoid being billed for subsequent shipments.