I'm very sorry your Bertha passed; I had a Bertha, too, now at the Rainbow Bridge.
Here's my suggestion for an avian vet in San Antonio (also posted in the "Texas" forum), not that far away from you, considering. Her name is Dr. Byrd (yes, her real name). It would be helpful to know what health issue you and/or Percy's potential future caretaker might be dealing with:
https://www.northernoaksvet.com
Best of luck with Percy!

https://www.northernoaksvet.com
Best of luck with Percy!