Amazon has 3.4-Oz Sensodyne Toothpaste (Pronamel Intensive Enamel Repair or Repair and Protect Whitening) on sale for $5.17 – 25% off when you ‘clip’ the coupon on the product page – 5% when you check out via Subscribe & Save = $3.81. Shipping is free w/ Prime or on $25+ or $35+ orders (minimum requirement varies by location).
Note: Coupons are usually one use per account, possibly targeted, and YMMV.
Available Deals (Price after coupon and checkout w/S&S):