I just recently started a group dedicated to look for such items and the things to buy them. [url=http://www.bungie.net/en/Clan/Forum/365233/0/1/2]Destiny Acquanistionists[/url], I'm still looking for members, and I'll be posting later tips and guides on gaining those items soon. Besides that, you could look up the gold chests for a chance at legendary items or go farming at spawning sites to pick up dropped loot.