Amazon has the 4-Pack of Crest Gum Care Mouthwash (16.9oz bottles, Cool Wintergreen) for $13.98 - 5% off with Subscribe & Save (can cancel anytime) - $2.10 off coupon (check “Save an extra” box, eligible on first S&S order for this product) = $11.18 with free shipping on $25+ or with Prime.