Got a walk-in Pfizer booster today. I've had 2 previous Pfizer vaccines in US and the last one the 7th of May. So it was time to get booster and thought I would have trouble finding one. Wife found out about the walk in and she found the other posting while we were there! Hope this helps everyone...not a walk-in but you can register here...If it's time for booster and you are sickly try here. Good luck!