There’s a $5 The Natural Dentist Rinse Rebate available on their 16.9 rinse.
Some are finding that their Walgreens has these on sale for $4.99 through 2/28/13. You might be able to get this one free after rebate!
Be sure to read the rebate for all details/requirements/exclusions.
Keep in mind that prices/sales and inventory can vary by Walgreens location.