Vaccine Standby Waitlists
These resources connect you with/are waitlists for End-of-Day surplus that would otherwise go to waste if not immediately administered.
You can also try your hand at calling local pharmacies and asking to be placed on a "Waste List" for cancellations & no-shows. I've been able to confirm with several Walmarts that they are doing Waste Lists that anyone can ask to be placed on - click on link below for more details.
There have also been numerous word-of-mouth surplus opportunities that have popped up every so often. You can keep an eye out for talk of these within the DFW Covid Vaccine Finder facebook group, but be aware that you're always taking a chance that it won't work out for you.