Prioritize Research skills to expand crafting options over time. This lets you make exactly the mods you want. Moreover, check vendors regularly as their inventory rotates. A mod you couldn’t afford before may show up discounted later.
You can also take on bounties and robberies for faction reputation to access their exclusive mod stock. Additionally, salvage dropped weapons for a chance to harvest attached mods. Useful if low on crafting materials.
And last but not least, explore hazardous areas – dangerous zones can have rare mods not found elsewhere as a reward for the risk.
Starfield Items, Credits