I've been thinking of adding PPC to my supp regimen but wasn't crazy about the choices of suppliers until now:
Jarrow Poly PC
You can search PPC or Phoscol (web) for more details.
NB: this ain't a first tier supplement and I'm not sure I'd add it (depending) unless your regimen is already extensive, or you have specific needs.
Oh and I have no commercial interests in Jarrow (or anyone else).