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Steam has Sins of a Solar Empire: Rebellion on sale for 75% off as the daily deal for 9/26/14.
Sins of a Solar Empire: Rebellion $10
Sins of a Solar Empire: Rebellion 4-Pack $30
Sins of a Solar Empire: Rebellion Game and Soundtrack Bundle $11.24
Sins of a Solar Empire: Rebellion – Stellar Phenomena $2.49
Sins of a Solar Empire: Rebellion – Forbidden Worlds $2.49
Sins of a Solar Empire: Rebellion Soundtrack $5