Your search for "C3850-NM-2-40G" revealed the following:

Cisco C3850-NM-2-40G Catalyst 3850 2x 40GB QSFP+ Switch Module

SKU: NSH-5724
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

$ 484.99

$ 1,116.99

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NEW Cisco C3850-NM-2-40G Catalyst 3850 2x 40GB QSFP+ Switch Module

SKU: NSN-1791
Condition: New
Shipping: Overnight Options
Warranty: 365 days