Amazon with Waterdrop Direct has the Waterdrop 15UA Under Sink Water Filtration System (WD-15UA) for $49 - 15% off coupon (clip coupon) = $42 with free shipping. Has 16000-gallon capacity, and includes filter, inlet/outlet hoses, 3/8"-1/2" convertor set, 2 self-tapping screws, teflon tape and drilling sticker.