My suggestion is to run a bunch of the strikes and collect as many weapon and armour engrams as you can and turn them in to the cryptarch. You should easily get the 2 coins you need. Xur is here till tomorrow, so you have lots of time.
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If either one of you need someone to play with shoot me a message and I'll try to get on
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Yeah, I did that and got one coin and I'm about to do it again. Thanks for the help!!
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This is your best bet