For a limited time, this Crest 3D 2-Hour Express Teeth Whitening Kit w/ 4 Treatments drops from $54.99 to $37.99 at Drugstore.com. Then, activate this link (click on "shop now") to drop your total to $32.99 at checkout. This is the lowest price we found from a trusted retailer (it beats Walmart's price low by $12). Note that you must checkout as a new customer for the extra discount, and it appears on the payment page. Sales tax is charged in most states.