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The Dual Rockets were obtainable by reaching level 50 on the police team in OG Season 4. Alongside that you needed to buy it for 30k cash.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Dual Rockets current MU count is at ~576, which is similar to most other uncommon items (such as White Marble or Blueportal), despite Dual Rockets being at common.