As one of its daily deals, Amazon takes up to 35% off a selection of 3M water filters. (You can take an extra 5% off select items by checking out with Subscribe & Save.) Plus, Prime members bag free shipping on all orders. (Non-members qualify for free shipping on orders of $35 or more; items under $35 receive free shipping via Subscribe & Save.) Deal ends today. A couple of best bets:

• 3M Aqua-Pure Whole House Water Filtration System for $64.29 (low by $16)
• 3M Aqua-Pure Under Sink Water Filtration System for $115.21 (pictured, low by $74)

If you're using Subscribe & Save, be sure to cancel your subscription once your order ships to avoid being billed for further shipments.