Got an appointment for Saturday. My eligibility (50+) begins in my state tomorrow (3/11). I actually had a choice between the Moderna tomorrow, or the one-dose Johnson & Johnson Saturday. I chose to be done two weeks from Saturday.
For the record: all the online registrations, mobile apps, and countless voicemails left didn't do me the least bit of good. Even the brand-new statewide registration website is still stuck on the previous age-group's phase for eligibility. A word-of-mouth phone-number for an adjacent county got me a human and an appointment inside of 5 minutes. Go figure.
I paid it forward and got several family members and neighbors signed up via that number as well.