do strikes and level up your vanguard, crucible, and faction. I think you get 5 each time you level them up. The engrams from strikes have a chance of being coins. Honestly they're not hard to come by, just don't think about it. Before you know it, you'll earn like 50 coins in a hour or 2.
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Yeah, I plan on not worrying about it anymore. I have like 165 right now, so I don't really have anything to worry about.