I think the best deal is on the Tide Boost Vivid White 18ct because it’s priced at just $6.75 so only $3.75 after coupon. It is an add-on item but still a really great bargain if you have other items to purchase on Amazon as well! Coupons can disappear quickly so order soon.
Note: The actual Amazon prices may vary and can change without notice. If the items above are not available at the listed price, the deal is no longer available. If that’s the case, just leave me a comment and let me know so I can mark it as such.