With orders of $25 or more, Amazon offers the
Orajel Spider-Man Anticavity Fluoride 4.2-oz. Toothpaste in Berry Blast for $1.97. Clip the 50% off coupon on the product page to cut it to
98 cents. With
free shipping for Prime members, that's the lowest price we could find by a buck. It's recommended for children age 2 and up.
Note: This item is part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.