Correct, PRP sells various VP fuels at the track, behind the tower.

There is a Sunoco on Route 30, Campbell's Sunoco in Irwin, about 30 minutes or so from the track that carries at least 100 octane unleaded, but I'm not sure if they carry additional race fuels.

CAMPBELLS SUNOCO
1111 CLAY PIKE
IRWIN, PA 15642-7430
(724) 863-9964