Earning!!!
Edit: tell me how you earned your thorn
And if anyone else is selling it, tell me who and how much
Edit2: [spoiler]so there are obviously some butthurt people in this post. So for those of you that are slow, this is satire.
I have a thorn. I know there's only 1 way to get it[/spoiler]
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I earned mine by beating a full lobby of Japanese 3star-ranking players on Rainbow Road in Mariokart 8.