Mine was a bonus for donating to APC back when it still needed donations. Then they were a prize for a contest. Currently I don't think there is any way for more people to get p3tz. I remember a while back something was said about more being done with them in the future. Hopefully that time is coming soon.
I stumbled across the p3ts feature in the user manual and was wondering if anything is currently being done to allow users access to the pets. It looks like a fun way for everyone to interact and pass time aside from our usual posting.