Amazon has the Cascade ActionPacs Dishwasher Detergent 60-Pack in Fresh Scent or Citrus Breeze for $12.97.
If you add it to your cart with the Subscribe & Save option on the right side, the price drops to $11.02 with Free shipping! That makes each dishwasher load just $.18 each! (And you can cancel the Subscribe & Save after your order ships in your Amazon account! It’s Free- no cost and no obligation for future shipments!)