Amazon has the 4-Pack Biotrue Multi-Purpose Contact Lens Solution (2 oz. Bottles) for $3.12 - 20% off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel at any time) = $2.34 with free shipping on $25+ or with Prime. 9 out of 10 people are satisfied with Biotrue.