I have found Pro-Mix products difficult to source in different areas. I've never personally seen it in a big box store, so I'm guessing it's carried regionally.
My suggestion is to find a local hardware store that can order it for you from their supplier. Mine is happy to order for me and gets it within a few days whenever they receive their next regular supply truck.
You might also have better luck with a place that caters more to commercial growers.
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