The current price of a Io Rune is 0.3 - 1.1 fg (d2jsp forum gold) and the equivalent in rune value is 2x Hel - 2x Hel.
Rune Information
Io RuneCan be Inserted into Socketed ItemsWeapons: +10 to VitalityArmors: +10 to VitalityHelms: +10 to VitalityShield: +10 to VitalityRequired Level: 35