Hi@akhtar,
If you are using RedHat/CentOs system, then Podman package comes with its dvd. You don't have to purchase it. But Podman concept comes in the current version of RHEL8. So if you want to install Podman in CentOs8/RHEL8, then use the bellow command.
$ yum install podman or
$ yum install container-tools
Hope this will help you.