You are signed into a Medicare plan that includes your meds. I have never heard of it or who is BC/BS. GoodRX does not couple with any other plan. It is not affiliated with Medicare. My Medicare G is the top part A/B plan Medicare sells. My 20% supp is AARP and my med plan is another totally separate company. Medicare has no say in the Goodrx plan and have no affiliation with Medicare. It is not a government plan.
That probably is the reason, because you are using a bundled plan through Medicare. In the end it is probably not saving any money. In Calif. we do not have to use a bundled plan, like Medicare advantage. That requires co-pays for any medical use. I do not pay one dollar extra for any medical health usage.
You can also contact the meds manufacturer and apply for their free programs.