Amazon has the 82-Count Finish Powerball Quantum Ultimate Clean & Shine Dishwasher Detergent Tabs (Fresh Scent) for $16.39 - $1.64 off coupon (check “Save an extra” box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel at any time) = $14 with free shipping on $35+ or with Prime. Roughly 17 cents per wash.