All packages are available in /var/cache/apt/
Yes.. you can copy the debs contained in the folder
/var/cache/apt/archives and paste it into the target pc’s folder.
Installation disc creator for packages downloaded via APT
APT removable repository creator and package backup tool for Debian based systems.
This tool will allow you to create a media (CD or DVD) to use to install software via APT in a non-connected machine, as well upgrade and install the same set of softwares in several machines with no need to re-download the packages again.