nitefall prison of elders and osiris are main places but i heard of random drops from crucible also if u can get to level 4 or five in iron banner plus doing it the iron banner way you reach level 4/5 ( cant remember which ) you could buy as many as u have glimmer for im doin iron banner tonight if u wanna join me Its only level 3 you need to get to then its 5000 glimmer so you can buy as many as u have the cash for that would be best way its guaranteed once you hit lvl3