Today is the first official instance of Xur selling Exotic Class Items. Youtubers and other sources have already discussed this, but I decided to make this post to share information here. First off, you need to have completed Dual Destiny and acquired the Exotic from there before you can purchase from Xur. Second, you can buy as many Exotic Class Items as you want, provided you have the Strange Coins to purchase them. The rolls will be random. Since Strange Coins are earned through normal play, you can pick your favored activity, and run it until you get enough coins to purchase an Exotic Class Item without needing to farm the Pale Heart.