B&H has a Used 200-500mm f/2.8 EX DG IF “Sigzilla” for Canon in 9+ condition available for $16,999.97 with free shipping. Compare at $25,999.00 new.

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Used Sigma 200-500mm f/2.8 EX DG APO IF for Canon – $16,999.97 Shipped (Compare at $25,999.00 New)