We can't place work orders for them since we have a class hall talent that gives a "chance" for missions to give us armaments or champion equipment. In theory, you should get some at least every 12 hours since that is what other classes get. However, I'm getting 1-2 a week or like 1 out of every 10 missions.
It SUCKS. My followers are still around 810 or 815 even though most of them are almost epic quality already. Blizzard seriously needs to fix the drop chance for these armaments or give us the ability to place work orders for them. Hate the RNG aspect of increasing my followers ilvl's. I can't even complete the epic/rare missions because my ilvl is too low.