Needing 2 Full Size Mattress Sets (Austin)

Hello, I am in desperate need of two clean used mattress sets for my son and I.
We are both disabled.
I have severe back and neck issues as well.
Searching for anyone who might have a good used mattress in their garage etc that is no longer needed.
Actually open to ANY kind of decent bed that would be good to my neck and back.
The other could be a plain mattress and box springs.
I would be most grateful.
Please contact me if you can help.
Thank you