I cannot tell you how long I have waited to see my baby Tiberon get the Midas touch. However, as a word of caution to those seeking to buy rivens, don't! I can smell a disposition nerf incoming, even though the Sicarus Prime has retained its disposition buff after buff, that's no indication of how the Tiberon's disposition future is going to look like.
I happened to come across a couple of promo codes that might interest people (last checked 16/11/2017 please inform me if any are broken so I can remove them):
Heatsword Orokin Catalyst slot: FREESWORD
Feel free to come and play warframe https://www.warframe.com/signup?referrerId=566d38c13ade7fc5727b2442
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The Tiberon Prime is the select-fire Prime version of the three round burst-fire rifle, Tiberon...