Yes they are. Look on SB County website
Yes, if you go to https://myoptumserve.com/covid19 to make an appointment. They do fill up quickly but when I went there with my father they did have a wait list you could get on. I think you would need to call and ask about getting on a wait list if you can not make an appointment though.
They did vaccines last Wednesday and Thursday thru a group Opuserve I think. Check the sbcovid19 website for it or at Community Center.
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