I use Falcon Insurance as my broker. I've been using them for 11 years and they've always been easy to work with and have provided good bids. Much cheaper than AOPA.
A broker is better than going directly to an insurance company, because different insurers prefer different risk profiles. The insurer that gives me the best rates may not be the same one that has the best rates for you because of our differing pilot experience.
https://falconinsurance.com/