Okay, surely I'm missing something in this...
Demon armor is:
MW full plate - 1,800 gp
MW d10 weapon claws - at a guess, 160 + 300 gp (460 gp)
+4 enhancement - 16,000 gp
+1 weapon enhancement - 2,000 gp
The contagion ability - the above leaves 32,000 gp
Contagion is a 3rd level spell. At the...