Maximize Knowledge

[RUMBLETiGER]

Magic Item Compendium p.185.

Can't find it in Eberron Campaign Setting.

 

[Empirate]

Have you considered masterwork items? Books, obviously, in the case of knowledge skills. Cheap +2 that should stack with everything you have.

The Paragnostic Apostle PrC in Complete Champion grants some nice tricks to go with your knowledge skill ranks.

Obvious Loremaster is obvious.