https://sellout.woot.com/offers/express-water-nsf-certified-reverse?ref=w_ngh_mc_itm_is_1_tl Express Water NSF Certified Reverse Osmosis 5-Stage Water Filter System (RO5DX) for $95.89. Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is $6 per order.