What are good sources of PS2 files?

My main interest is the preservation of media history. To that end, I am looking for a good source of PS2 files so that I can catalog and archive them into a dedicated USB HDD. Then I’ll store the drive in the random nuclear fallout shelter the house I bought came with until the day the world needs a copy of ‘Little Britain: The Video Game’.

Seriously, any suggestions for collections sources would be appreciated.