PLEASE NOTE: Once you place a fresh-frozen 3-pack in your cart, the free bottle of E3Enzymes Supreme 60ct will be added automatically during checkout, no coupon is necessary. The Buy 1 Get 1 Free E3Enzyme offer is valid on any size E3Enzymes Supreme that is still in stock. To receive the discount, you would place 1 bottle of any size E3Enzymes Supreme in your cart, the 1 free bottle (of the same size) will be added automatically during checkout, no coupon is necessary. No substitutions.