The Internet Archive hosts legal redump collections. While you usually get ISO files, the community uploads "Pre-PKG'd" folders regularly.
Disclaimer: Downloading copyrighted games you do not own may violate laws in your region. This guide is for educational purposes and backing up your own physical discs. download games ps3 hen pkg top
It saves storage space on your console since you can "stream" the installation from your computer. NoHAN / PKG Resigning: The Internet Archive hosts legal redump collections