This mod can be purchased unranked from the Void Trader Baro Ki'Teer for 140,000
140,000 and 400
400. Note however that Baro Ki'Teer's stock changes with each appearance, and may not have this item available at every time.
Primed Bane of Corpus is essentially the Bane of Corpus mod with Legendary rarity and 5 more ranks. It is considered the same mod as its Uncommon counterpart, and thus both mods cannot be equipped together.