There are two major costs involved in Oreos, sugar (the product’s main ingredient) and labor. You mentioned Right to Work states, ok. I cited the sugar tariff problem.
For some quick insight into that, this article is as good a place to start as any:
I would have paid for the Oreo’s at the market price when they were made in America. Now I won’t buy them at all. Nabisco made their choice and I made mine. I hope President Trump teaches them a lesson.