Your search for "N6K-C6004" revealed the following:

Cisco N6K-C6004-FAN-F Back-to-Front Airflow (Fan Side Intake) Switch Fan

SKU: NSH-2896
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

$ 69.99

$ 146.99

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NEW Cisco N6K-C6004-M12Q Nexus 6000 12x 40GB QSFP Switch Module

SKU: NSN-8351
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Cisco N6K-C6004-M12Q Nexus 6000 12x 40GB QSFP Switch Module

SKU: NSB-0752
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Cisco N6K-C6004EF Nexus 6000 Series 6004 EF 8x Expansion Slot Switch Chassis

SKU: NSB-7129
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days