Product review (5 stars): And Local Businesses Wonder Why We Shop Elsewhere
I used to buy these humidifier filters through a family-owned business that services our furnace.  Last year prices jumped from $18 to $40 for just one panel.  When questioned why, they complained costs are skyrocketing for everything.  Because I was a loyal patron for 25 years, they'd reduce the price to $29.  At that point, I knew it was time to shop around.  Now I wonder what else this heating/cooling company overcharges me and others.

The 318518-762 filter is the same one I used to buy locally.  Amazon sells through National Trade Supply Company, but the company also goes by different names and websites.  A pack of two on Amazon offered through National Trade Supply currently costs about $47.  I purchased two for $39 (free shipping) from the same company, but through their other website called DiscountFilters.  The price per filter has gone up by a few dollars, but the increase is nowhere near what our local company led me to believe.

I'm just glad home appliance parts and items like this water panel can be purchased online.  Everyone wants to support their local community, but we also expect honest service and reasonable prices.