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The JDM was obtainable in Season 6: "Race to the Top" by reaching level 6.
While JDM isn't a spoiler that's looked for often, when it is looked for it can quite easily get 1M. Its interchangeable with other 1M cosmetics (such as BlueS3, Guitar Riff or Neo-Static), and can very easily get 750K items (such as Fall Chrome, Deathtrap or OG Rocket Thrusters) with adds, its also generally treated as a 1M add in bigger trades.