D20:Shield Spike, Light Shield Weapon

You can bash with a spiked shield instead of using it for defense.
When added to your shield, these spikes turn it into a martial piercing weapon that increases the damage dealt by a shield bash attacks as if the shield were designed for a creature one size category larger than you. You can?t put spikes on a buckler or a tower shield. Otherwise, attacking with a spiked shield is like making a shield bash attack (see above).
An enhancement bonus on a spiked shield does not improve the effectiveness of a shield bash made with it, but a spiked shield can be made into a magic weapon in its own right.

These are the prices for this item when made with specific materials or enhancements.

• Masterwork: 310 gp (+1 enhancement bonus to hit)
  
• Adamantine: 3,010 gp (price includes masterwork)
  
• Alchemical Silver: 30 gp (-1 damage)
  
• Cold Iron: 20 gp (+2,000 gp if enchanting this item.)
  
• Darkwood: N/A
  
• Deep Crystal: 1,010 gp
  
• Crystal, Mundane: 310 gp
  
• Mithral: 2,500 gp (price includes masterwork, halve weight)
  
• Magic^*
  

:+2: 8,310 gp (+8,000 gp for +2 enhancement bonus):+4: 32,310 gp (+32,000 gp for +4 enhancement bonus):* Magic items must be masterwork. Costs listed are for steel weapons.

• Weapon Qualities
  
• Magic Items: Weapons
  
• Magic Items: Armor
  
• Equipment (SRD)
  
• Wikipedia: Shield
  

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System Reference Document -> Equipment (SRD) -> Weapon Descriptions