Amazon.com has Finish Powerball Tabs Dishwasher Detergent Tablets, Fresh Scent, 90 Count on sale for $14.54 then you can clip a 25% off coupon found here. That will make this 90 count package just $10.90 shipped (maybe + tax depending on where you live.) That would make each tab just 12¢! Two day shipping will be free for Amazon Prime members, if you chose no rush shipping you will get a $2 credit for eBooks, digital videos, and more. Shipping should also be free when you spend $35+ on Amazon.
OR if you chose the Subscribe and Save option your price will go down to $13.81 before coupon and will go down to $10.35 or just 11¢ each.