Refer to the distributors for what? I buy the 3 pack at HD and put in myself.
I used curbside service where an associate located the items for me. I was shopping for this item during the coronavirus pandemic, so I could not say exactly where this item was located.
I had a gap so that when the AC turned on, it would suck up the filter and when the AC turned off, it would drop it back down. Noise drove me crazy. If this is what yours does, I found a simple solution. I found a roll of insulation foam (sticky on one side) the same width as the ledge that keeps the filter from being sucked into the unit. Put it along all 4 edges. No gap, no noise. Hope this helps. Tip from AC tech: turn the unit off when taking the filter out then turn it on when putting the new filter in. No more trying to hold the filter in place while you close the screen and put the screws back on!
Yes the price was $7.74