6 Golden Keys are posted and will remain active until August 27th; get them while they're hot. http://orcz.com/Borderlands_2:_Golden_Key#Latest_Shift_Codes
I was playing UVHM with my level 59 Psycho when a chubby (tubby?) stalker dropped the Whisky Tango Foxtrot. Unfortunately, I only got to see it and another player picked it up before I could. I look for legendary items all the time in chests and vending machines, but I rarely see them myself. I get most of mine through freebies/trades.
I picked up a blue Zero mode that had 50% melee and +6 killing blow and +5 something, uhh I think it was Lethal Ninja. I'm tempted to start using my Zero again. He's difficult to use, but so rewarding once you get into the right rhythm.