It is very difficult to get them without Xbox live gold. Also, you need Xbox live gold to see Xür, Agent of the Nine, who you spend the strange coins with.
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No you don't you can buy things from him just fine without gold
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I just saw him in the tower and bought some exotics from him!!! Scratch what I said earlier.
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I went to where Xür was in the Vestian Outpost and he wasn't there. I've never seen him in the tower either.