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The Shell Speaker was obtainable in Season 16: "Summer Beach Party" by reaching level 9.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Shell Speaker's current MU count is at ~88, which is similar to most other very rare items (such as Afterburner or Mecha Arm), and even lower than some very rare items (such as Spider Leg which is at ~114), despite Shell Speaker being at rare.