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Go down to your friendly neighborhood dive bar and..... Oh you mean strange coins. Weekly heroic strikes at level 28 give you 9. That's 27 a week if you have 3 characters. Most of them can be done solo if your character is at least level 27. I haven't tried it with anything lower. I'd help you with it if I wasn't out of town.
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I do tiger strikes until my eyes bleed and get coins from the engrams. The most effective way other than weekly on 28. I just pulled 5 out of 20 blues. That's about 1-2 hours of tigers.
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Strike playlist, level 24, engrams sometimes turn into strange coins.
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Street corner
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Take her out to dinner first
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A nightclub.
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Fastest way is do level 28 weekly to get 9, I do it 3 times a week for my 3 characters and get 27 a week. That's the fastest way