Vasarin Redmorn can be found in the Sunreaver Pavilion of the Argent Tournament Grounds in Icecrown. He offers various items to players who have earned the achievement 
The Sunreavers.
Vasarin at Dawnseeker Promontory, Isle of Thunder
Vendor info
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[Sunreaver Tabard] 50 
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[Sunreaver Hawkstrider] 100
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[Sunreaver Dragonhawk] 150
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[Shimmering Wyrmling] 40
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Patches and hotfixes
Patch 3.2.0 (04-Aug-2009): Added
