D20:Caster's Shield Magic Armor

Caster?s Shield: This +1 light wooden shield has a small leather strip on the back on which a spellcaster can scribe a single spell as on a scroll. A spell so scribed has only half the base raw material cost. Experience point and component costs remain the same. The strip cannot accommodate spells of higher than 3rd level. The strip is reusable.
A random caster ?s shield has a 50% chance of having a single medium scroll spell on it. The spell is divine (01?80 on d%) or arcane (81?100).
A caster?s shield has a 5% arcane spell failure chance.
Moderate abjuration; CL 6th; Craft Magic Arms and Armor, Scribe Scroll, creator must be at least 6th level; Price 3,153 gp (plus the value of the scroll spell if one is currently scribed); Cost 1,653 gp + 120 XP.

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System Reference Document -> Specific Magic Armor