Ending at 11 pm ET, APlusChoice via eBay offers this Reverse Osmosis 5-Stage Water Filter System for $86.90. Apply coupon code "PGET15OFF" and checkout via PayPal for a final price of $71.90. With free shipping, that's $17 under our May mention and the lowest price we've seen for any reverse osmosis water filter system. (It's the best deal for this model today by $18.)It filters up to 50 gallons of water per day and can be attached to the kitchen tap or installed under the sink. Features include quick-connect fittings, a 3.2-gallon water storage tank, water pressure gauge, and faucet.

Note: This coupon can be used once per account.