Alder is the “new discovery” in the door and cabinetry business. Almost a weed wood, it arrives at the manufacturing plants priced lower than most everything else.
With the rustic craze in play in many markets, knotty alder can command a premium price.
Is alder plywood available to you, and have you used it? How is it priced relative to oak, maple, and birch, all of which are the lower tier of hardwood plywood, in terms of price.