I have BlueCross BlueShield of IL HMO BlueCare Direct. Where can I get a flu shot?

I have BlueCross BlueShield of IL HMO BlueCare Direct. Where can I get a flu shot? My local Walgreens told me they only have contract with BCBS PPO?

BlueCare Direct is a partnership with the Advocate hospitals. You can go to any Advocate Hospital or urgent care center, or to any Walgreens that has an Advocate Minute Clinic in it.