Product review (4 stars): Walmart has these for cheaper!!  Don't buy here!
I purchased these because I originally could not find them at our local Walmart.  While I was waiting for them to ship, a friend told me these filters can be found in the pharmacy area, near the vaporizers, NOT in the area where the room humidifiers are located.  That's where I originally looked.  So, do yourself a favor - check your pharmacy area first!  This price is ridiculous!