you can get them from catalog.redhat.com i.e: for the rhel/ubi9 images :

https://catalog.redhat.com/software/containers/search?q=ubi9...

red hat has some sort of partnership with docker to have them available in docker hub, i guess it's just not there yet...

https://www.redhat.com/en/about/press-releases/red-hat-bring...