Amazon has the 50ml Crest Scope Squeez Mouthwash Concentrate (Original Mint Flavor) for $6.97 - $1.98 off (check “Save an extra” box, eligible on first S&S order for this product) = $4.99 with free shipping on $25+ or with Prime (extra 5% off with 5 items S&S order). Up to 50 uses, equal to a 1L bottle.