The pre-made cookies that I've used before in dayboards, sometimes calle Swetzler's or Sweetzler's, are actually Sweetzel's spiced wafers. If someone is looking for these, or their ginger snaps, the company can be contacted at:
Sweetzels Cookies
Skippack, PA 19474
1-800-932-7323 or in PA 215-513-1800
for mail order call 800-545-4891
It's a no-artificial-ingredients cookie based on a colonial Spice and Molasses cookie recipe; but it IS a cheat for dayboards, as it's leavened with Baking Powder.