Vemlidy no longer in formulary effective July for major prescription coverage

Hi my name is John and just got diagnosed with chronic hepatitis B in the US. I am just looking for the best way to figure out the best insurance for me that covers hep B medication. I apologize if there is a feed for this already. I contacted by insurance and had to go thruogh this long process where they looked up the price for each drug. Now I am wondering if there are cheaper plans for my drug and how I would find them. Thanks.