Rakuten (via iSpring Water Systems) has the iSpring RCC7AK 6-Stage Under Sink Reverse Osmosis Drinking Water Filter System for a low $179.99 Free Shipping after Coupon Code: "HOME20" (Exp Soon). Sells for $220 elsewhere, so you save 20% off. This is a great price for a 6 stage water filter system. Comparable units normally sell for $300 or more elsewhere.

This model has a 6th Alkaline Remineralization filter which restores healthy minerals and produces a balanced alkalinity, which gives the water a more natural taste than regular 5 stage RO water.