There’s a fantastic deal on Finish Dishwasher Cleaner 8.45 oz at Amazon. This is on sale for $4.88, plus you can save 5% when you subscribe and there is a $0.49 coupon on the item page. That makes the final price just $4.15.
Finish Dishwasher Cleaner 8.45 oz– only $4.15 with sale, subscription and coupon (reg. $5.99)