Amazon has the Crest 3D White Professional Effects Whitestrips Whitening Strips Kit w/ 2x 1 Hour Express Whitestrips for a low $29.99 Free Shippingafter clipping $15 off coupon from product page. This normally retails for $68, so you're saving 55% off. Walmart is offering the Twin Pack (40x Treatments, w/o express strips) for $44.88 Free Shipping. This breaks down to $1.12 per treatment.
Lasts 12 months and beyond
Removes 14yrs of tough set-in stains from coffee, wine, smoking
Use the same enamel-safe whitening ingredient that dentists use
You'll see a whiter smile after 3 days, and full results in 20 days
Strips mold to the shape of your teeth and come off cleanly