Amazon offers the Finish Powerball Tabs Dishwasher Detergent 90-Count Box for $11.03 with free shipping via the steps below. That's tied with our mention from two weeks ago and the lowest total price we could find by $6. To get this deal:
  1. View the Finish Powerball Tabs Dishwasher Detergent 90-Count Box for $13.87
  2. clip the $2.15 off coupon on the product page
  3. order via Subscribe & Save to yield a final price of $11.03 and bag free shipping
Be sure to cancel Subscribe & Save after your order ships to avoid being billed for subsequent shipments.

Update: As a reader found, Costco stores offer two Finish Powerball Tabs Dishwasher Detergent 110-Count Boxes for $16.99. (Note that the link is for reference only; it's not available online.)