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The RTX rim was obtainable in Season 5. "Let the Memes Begin" by reaching level 9.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
RTX hasn't been performing that good recently. With no traders willing to trade for it at the moment, most owners are willingly taking underpays in order to get rid of one. This hardly gets 16M in mid demands, and is generally lower demand than Spinner as of right now (albeit not by a lot).