User blog comment:Silicon Soldier/Xûr's Inventory: August 14, 2015 - August 16, 2015: Gjallarhorn Edition/@comment-26625664-20150814233433/@comment-5985981-20150815162759

If you haven't done the weekly heroic strike with any of your characters on the highest difficulty level, now will be a good time to do so now because Xûr will be leaving the tower tomorrow.

You can also get coins from rare engrams too.