Good place to farm T3 keys?

[NicoV001]

So,do any of you know where is the best place to farm T3 keys right now?

[Ixxolos]

I use T1 survivals for getting T3 exterminate keys recently. But my main T3 key farming nodes are Zeugma on Phobos, Triton on Neptune and Lilith on Europa.

Also the key drop locations can be found on the warframe wiki website. Hope that helps you fellow tenno.

[Coaa]

Zeugma - Phobos gives lots of t2-3 keys and TONS of r5 core packs (more then the other two popular spots) but no one ever runs it because they all flock to what some dude posted on the forums ages ago. Go enjoy the secret spot before it explodes with people!

[Jiminez_Burial]

Depending on how good you are, and then even more so if you have a group organised to do so, Spy missions are best.  I find that Sao Neptune is the fastest.  The main reason for this is that with the changes made to excavation (only having a single excavators location revealed beyond the active) and the fact that you can have 1 person do each vault in a spy mission, you can finish a spy mission in less time than it takes to go through the rotations.  

[NicoV001]

okay,thanks for the info guys