Currently there are Fifteen vendor stores in the Core-Exiles game that sell Module Schematics. Between them they sell over 800 different schematics for all kinds of items. Modules are a sub requirement of schematics.
Generally speaking module schematics require resources and commodities found within the game from all professions, combat loot, mining, refining, salvaging etc.
Always check you have the prerequisite skills to use the module schematics as these will require Production and Manufacturing.
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