ok this is server dependent if your like me and have spare honor points go to Sergeant Major Clate - NPC - World of Warcraft
he sells Sergeant's Cape - Item - World of Warcraft for 55 honor points witch disenchants into Large Brilliant Shard - Item - World of Warcraft
now the reason you need Large Brilliant Shard is for the enchant Formula: Enchant Weapon - Agility - Item - World of Warcraft its the only enchant that can go on the BoA leveling weapons happy Disenchanting and making gold.
BTW on my realm the shards go for 50g each but if you have bountiful bags guild perk you sometimes get more.