Happy Day! Bittermen's Amere Nouvelle is now being distributed. I haven't seen it yet in the Boston area, but DrinkUpNY has it for NYC and mail order (into those states that can). Also, if you click the Amer Picon link in the recipe, you'll find similar information to these comments.
Used Laird's and New Liberty's "Liberty Belle American Picon", tasty. Would maybe add the tiniest splash of syrup next time, which Goldenmoon's Amer Picon attempt also needs in most drinks