I checked and quite a few online places had it and offer free shipping if you cannot find it locally. I was confused though. Does it come in different concentrations? I was seeing too broad a price spread not to be comparing apples to oranges I fear. I suspect the lower prices were dilluted?
And, I do not shop in box stores unless I have to but I checked online and the local Home Desperate store here had some version/concentration of the product in stock and there was an "order online and ship to store" option. If you have half a day to waste, you could keep asking orange apron people to special order for you? The first seven will have no idea what you are talking about though.
Anyhow, I just used the product name for the Google search. Same on Amazon. Too many hits to list them but you should have no trouble finding them yourself.