Here is the current list of Ter'Angreal available for purchase and their price. Most of these fit in the palm of your hand unless noted otherwise.
Earthquake - 10,000 gold f/ 10 uses - Make the ground beneath your enemies become a quaking nightmare - Desc: A split rock spire of smooth marble
Fireball - 5,000 gold f/ 10 uses - Direct a fireball the size of a large horse - Desc: A ruby modeled as a small torch
Invisibility - 20,000 gold f/ 15 uses, 'spell' lasts fifteen minutes - Move under bent light, but when moving the shield will flicker - Desc: A cloak made of crystal
Ward of Silence - 4,000 gold f/ 10 uses - Shield an entire room or a small area so that only those within it can hear you - Desc: A large bat made of rough stone