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The Caveman was obtainable in Season 33: "Jurassic" by reaching level 8.
Caveman Texture is the newest L8 reward from the most recent season. Its comparable to other 250K textures such as (but not limited to) Chilling, Vibrant Hologram or Touchdown, and is very much interchangeable with those.
Supply is widely distributed — no single holder owns enough to register as a hoarder.