All of the savager mods are currently locked behind Banshee's Packages but it's SOOO expensive to level him up that you'll go broke just trying to level him up to not even get one savager mod.
I don't remember why they increased the cost for him. I just remember people were exploiting him till Bungie has to increase that amount of materials it takes, but now, it's locking some of the best mods in the game. Can we get a fix for this PLEASE?!?!
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Bungie did say you don't have to grind for the scavenger mods if you didn't want to as next season they will be available to everyone without being tied to a affinity.