For Prime members only, Amazon offers a Crest 3D White Sample Kit
bundled with a $4.99 Amazon Credit
with free shipping
. (The credit is redeemable for select Crest and Oral-B products.) Assuming you'll use the credit, that makes the item essentially free and is tied with our mention from two weeks ago as the lowest total price we could find. The items include a Crest 3D White 1-Hour Express Whitestrip treatment, Crest 3D White Radiant 2.5-oz. Mint Toothpaste, and Oral-B Glide Pro-Health Floss.