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I can't stress this point enough. If you don't have 18 strange coins, running the weekly on level 30 will give you 9. Blue engrams also have a chance to drop a strange coin. Lastly, crucible games and reputation packages also have a chance to have a strange coin. If you don't have an icebreaker, and can't afford one, I would HIGHLY suggest you run the weekly strikes to get the 17 coins.
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Although it's nice to have more than one, I recommend only buying one, and waiting till Sat night to buy a second if you want it. RNG being how it is, you're likely to get one from a crots/vog run between now and then lol