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
• Only 2 remaining
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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