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The Stance rim was obtainable in Season 15: "Drift to Japan" by reaching level 7.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Stance is quite a rare item to spot in trading, with it being quite an old item and having a quite low MU count of only around ~180. While it isn't as low as other rare items, it is a lot more difficult to spot compared to other uncommon items (such as Snowchain), and is similar in rarity to other rare items (like Hypno).