With orders of $25 or more, Amazon offers Prime members the Crest Complete Whitening + Scope Outlast Mint 5.8-oz. Toothpaste for $2.97. Clip the $2 off coupon on the product page to cut the price to 97 cents. With free shipping, that's a buck less than what you'd pay at your local store. The toothpaste strengthens teeth against sugar-based cavities and removes surface stains.

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Note: This item is part of Amazon's "Add-on Program"; it can only be purchased with an order of $25 or more.