Product review (5 stars): Perfect fit for my whole-house humidifier (Aprilaire)
Perfect fit for my whole-house humidifier (Aprilaire).  For the price of half of one at the Big Orange Box, you get two, and the filters are the real ones, metal with a clay-like coating, not plastic mesh.  The service guy who came to do seasonal maintenance on our furnace was shocked at the deal and quality.