Books:
Efficiency (any level): Eff5 6k, Eff4 2.5k, Eff3 1.25k
Power (any level): make me an offer
Sharpness (any level): Sharp5 6k, Sharp4 2.5k, Sharp3 1.25k
Protection (any level): Prot4 2.5k, Prot3 1.25k

Gear:
Protection 4 diamond pieces: 3k each or 11k for a set.
Sharp 5 Knockback 2 diamond swords: 6k each