Not the cheapest alternative, but Vermont Nut-free Chocolates makes "Skippers":
i haven't had tried the Skippers but all of their products are peanut- and tree nut-free.
Personally, I let DD have home-baked goods that are brought to her class. Her teachers check everytime someone brings in a baked good and if there is any question, they don't give it to her. Some parents wouldn't be comfortable with that. You could attach an ingredients list that parents can reference.
thanks for even trying to find a safe alternative!