Amazon has the 3-pack Clear Eyes Maximum Redness Relief Eye Drops (0.5 fl. oz. Bottles) on sale for $13.77 - 35% off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel anytime) = $6.46 with free shipping on $35+ or with Prime.

This contains 2.5x the redness reliever active ingredient compared to the standard Clear Eyes drops.