YMMV double coupon method. Amazon has the 90-Count Efferdent Retainer Cleaning Tablets (Minty Fresh & Clean) for $4.10 - $0.36 off coupon (click the one-time purchase option) - 25% off (check “Save an extra” box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel at any time) = $2.51 with free shipping on $35+ or with Prime.