The Morrissey Lab sells polyphosphate and biotinylated-polyphosphate through Kerafast.
Long chain polyphosphate (p700)
Kerafast
Medium chain polyphosphate (p100)
Kerafast
Biotinylated Polyphosphate, long chain (p700)
Kerafast
Biotinylated Polyphosphate, medium chain (p100)
Kerafast