I've also had a hard time sourcing chicken livers. Most markets within reasonable distance from my Southern California home don't have them. (What do they do with all these livers???)

Recently I discovered that Whole Foods has them. Then turkey season / Thanksgiving was upon us, chicken livers vanished, but were replaced with turkey livers! I look forward to trying those. Sauteed chicken livers are excellent with mushrooms and marinara sauce...