Bundle containing useful skillbook is a level 50 Superior item in AION Retail 7.8. Felder sells it.

Where to get

Sold by

NPC	Price
Felder

Similar items

Item	Grade	Level
Construction Odium of Magic	Common	50
Lunime Cocktail	Superior	50
Litrea Aether Cream Pasta	Heroic	50
Jerky for Pets	Fabled	50
Eternal Panacea: Masterful Attack Boost	Eternal	50
Special Packaging Scroll (Weapons; Mythic)	Mythic	50
Fragrant Root	Junk	50