Where can I buy Fusion Cores in Fallout 4?
You can buy Fusion Cores across the Commonwealth! Good places to start are Diamond City or Goodneighbor. Vendors there often stock them. Also, check out any trading posts you find and the roaming merchants; some of them have a surprise stash of Fusion Cores for sale. Don't forget to bring your Caps, those babies aren't cheap.
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Arturo in Diamond City is your go-to guy for Fusion Cores, and Kleo in Goodneighbor won't let you down either. They usually have a couple for sale. If you're feeling adventurous, head to the Prydwen; Proctor Teagan might have some for sale if you're in good with the Brotherhood of Steel.
Honestly, just explore and loot. Fusion Cores can be found all over the place in generators and sometimes in power armor frames. Buying them is a waste of Caps if you ask me.
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