Product review (5 stars): Best deal I could find right now....
Yes, it is a bit misleading because the link directs you to a one filter option, but they do have 3 and 6 filter packs.  I bought a 6 pack for $50, and I searched the internet for "Filter America Coupon Codes" and found one that got me free shipping, so I only paid $8.33 per filter.  Much less than the $15 per filter at Amazon.