Source for Treasure Sweet Corn seed
Last place I was able to buy Treasure sweet corn was Schlessman Seed Company. It was an "All-American" award winner, but I have not found a seed source.
Dunn County Wisconsin
It doesn't seem to be available in the US, based on a Google search. 'Treasure' doesn't show up in the list of All-America Selections winners for sweet corn (http://all-americaselections.org/product-category/edibles-vegetables/corn-sweet/).