Costco has a six-count pack of Colgate Total Advanced Whitening Toothpaste (6.4-ounce tubes) for $12.99 right now at Costco — $6 less than its regular online price. To compare, Sam’s Club ...

Toothpaste has a shelf-life of about two years before it’s ingredients start to degrade, so if you’ll use up a half-dozen tubes before then, Costco has a six-count pack of Colgate Total ...