If they are selling out so quickly one would think they would increase their order.
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Something about this reminded me of when I tried to get another marvelous carpet cutter. Months later I went back and they said they no longer carried the Blue Thunder carpet cutter, they had no way of ordering, they simply took what their suppliers furnished them. The first one, Blue Thunder, worked nicely with my 70 plus year old hands in taking up a room full of carpeting that I had hated for so long. It cut the carpet like it was denim. The new one I bought didn't work as well at all on another carpet, gave me blisters. And not one of them had a circular blade !!!
Sorry, this was at Home Depot, never heard of Harbor Freight at that time.