. >> the federal government sends see vass supply notifications. see vass applies what's called a social vulnerability index and selects locations and updates its appointment system. cvs says it does that regularly but we saw the biggest batches of appointments open each night, overnight, generally around 1:00 a.m. people grabbed them fast so you might have to stay up late or get up early to grab one. >> we absolutely are encouraging everyone to check regularly and not to feel defeated or feel like there's no vaccine left. >> walgreens says it updates inventory weekly but wouldn't tell us what day. one message we've heard loud and clear is pharmacies do not accept walk-ins. >> we are actually not allowing anyone to come into the stores and recommending that people don't do that. >> you must have an appointment to get a covid-19 vaccine at a pharmacy. that being said, consider calling nearby pharmacies to see if they're keeping a local standby list for no shows or leftover vaccine. you don't get much notice but you might get seen much faster. it wor