Question: what exotics does xur sell?
Answer: Vigilance Wing (Exotic pulse rifle) -- 29 Legendary Shards.
Starfire Protocol (Exotic Warlock chest armor) -- 23 Legendary Shards.
Frost-EE5 (Exotic Hunter leg armor) -- 23 Legendary Shards.
Armamentarium (Exotic Titan chest armor) -- 23 Legendary Shards.