Good luck.
I don´t know when last I saw a POC album in a music store. You might strike it lucky and get your hands on Ghetto Code, their most recently released album (1997). Age Of Truth (1993), it seems, is out of print. Phunk Phlow (1994/5) was only released on ca**ette. Their first two albums Our World and Boomstyle were only released on ca**ette and vinyl.
I´ve got all of them (ranging from CDs to tapes) but I can´t sell or trade. I´m holding on to those babies because they´re history.
PEACE
Supafly