At Costco, members can buy one Finish All-in-One Dishwasher Detergent Powerball Tab 110-Pack for $16.99 and get a second one for free. (Add one to cart; the second one will be added automatically. Non-members pay $1.70 more.) With free shipping, that's $0.08 per tab, tied with our expired mention from three days ago, and the lowest total price we could find by $26 for this quantity of tabs elsewhere. Deal ends August 31.
Of note, you can buy up to five 110-packs and get five more free for a total of 10 boxes. This item will also take three to four weeks to ship.