Amazon has the 4-Pack 16.9oz Crest ProHealth Advanced Alcohol Free Extra Deep Clean Mouthwash (Enamel Care or Multi-Protection Fresh Mint) for $13.98 - 5% off with Subscribe & Save (can cancel anytime) - $3.50 off coupon (check "Save an extra" box, eligible on first S&S order for this product) = $9.78 with free shipping on $25+ or with Prime.