I have been impressed with the Medicare Plan Finder tool listed on the government Medicare site. You put in your zip code, Medicare number, drugs you take and it will list available Medicare Advantage Plans with and without prescription drug coverage, and stand alone Prescription Drug Plans both tailored to fit your needs. It also has ratings of the plans as well as costs. Pretty handy tool located at:
https://www.medicare.gov/find-a-plan/questions/home.aspx
https://www.medicare.gov/find-a-plan/questions/home.aspx