You used to be able to buy strange coins from Xûr for Spinmetal and Spirit Bloom... That's crazy.
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It went live for 30mins, you could buy only 1 for those materials (so if you were short just 1 or so you could still buy something). But people bougt Strange Coin, deleted character, made new character bought Strange Coin, rinse and repeat. Bungie saw the problem and ended it immediately.