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You can get them from sortie missions from time to time as they have pretty low drop chance
http://warframe.wikia.com/wiki/Invasion
Also, every time a Devstream happens, there's a special Gift of the Lotus alert that will award either an Orokin Catalyst or Orokin Reactor.
Quick and easy to see if there's anything giving out a potato.
2) Catalyst or Reactor after devstream every two weeks on 24 hour alert.
3) Buy it with platinum.
4) Weapons and warframes that you buy on market come with slot and catalyst/reactor installed. Not really the best way.
5) Random reward from sorties. Rarely.