Guild vendor

Guild vendors are NPCs found in capital cities that sell items awarded by guild reputation and guild achievements. The items they sell cannot be seen until you meet certain reputation level and/or achievement requirements. * in Stormwind City
 * in The Exodar
 * in Ironforge
 * in Darnassus
 * in Boralus Harbor
 * in Orgrimmar
 * in Undercity
 * in Silvermoon City
 * in Thunder Bluff
 * in Shattrath
 * in Dalaran
 * Guild Page
 * Guild Herald

Discounts
While as a rule guild vendors have no faction, Riha is a member of The Sha'tar, a neutral faction that players can gain reputation with in Burning Crusade. Being with them will therefore give you a discount when purchasing from her. This can translate into significant savings over time for guild members, and on large guild upgrades for guild leaders that are Exalted with the Sha'tar.