On the Mangler Server, the spells Remove Curse and Remove Greater Curse should not be purchasable in Plane of Knowledge. However, they are currently on many of the vendors.
Notes: Item 19522 - Spell: Remove Greater Curse is available on merchants in PoK once PoP has unlocked Item 19542 - Spell: Remove Curse is available on merchants in PoK once PoP has unlocked