Wainscoating where to buy?
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Big box stores carry the materials. You can probably pick up at any lumber yard.
Any home improvement store! If they don’t have what you’re looking for in stock they can probably order it. :)
Tongue and groove wood can be bought in packages, as can beadboard wainscot. You can also create your own using trim molding or other lumber. All can be found at Lowes or Home Depot.
Your local home center would be best. https://www.homedepot.com/b/Lumber-Composites-Paneling-Wainscoting/N-5yc1vZcbqg