I haven't yet seen a merchant carry them, though I did recently find one in a highly irradiated nuclear waste storage. The storage is straight east from sanctuary, it's a bit of a walk and its easy to miss as it's just a small concrete building. Once inside there's a terminal and some ferals, hack the terminal and open the door directly beneath it, fusion core is in a machine similar to the first one you see
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Damnit! I found that one and definitely sold it. Maybe I can buy it back, I'll check tomorrow. Appreciate the help homie
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Iv found then on dead turret parts Iv gotten like 20 just sitting in my bag lol.