Do they give flu shot

Yes, for a fee

Some CVS have a sign up for free (fine print: most insurance, etc). Some CVS have minute clinics inside, some have pharm techs or whatever they are that will do injection, but I'd ask to see the bottle/injector, and run like hell if you don't (like them, see what you are to be injected with, and opening to injected, as even hospitals get it wrong) probably limited to muscle mass injections, check for your safety in JanePharmTech licensing mad skillz requirements, etc.