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Amazon has this sale on Crest Whitestrips Pro Effects 40 Count or Crest Premium White Strips 28 Count for $13 with free shipping after coupons and subscribe & save discount.

1. First, Log into you Amazon Account
2. And then click this link
3. Scroll Down to where the coupons are ("your coupon book")
Refresh the page repeatedly until you see "Save $7 On any ONE Advanced Vivid 14ct, Professional Effects, Gentle Routine, Stain Shield, Premium, Advanced Seal 14ct, Pro Effects, Daily Whitening Multicare, Daily Whitening + Tartar (excluding Classic)"
4. Click the coupon link & add either Crest Whitestrips Pro Effects 40 Count or Crest Premium White Strips 28 Count to cart
5. From the cart click on the product link
6. Once at the product page choose Subscribe & Save and proceed through checkout.
7. Your total for either item should be ~$13 with free shipping