Your search for "c3850-nm-2-10g" revealed the following:
Cisco C3850-NM-2-10G Catalyst 3850 4x 1GB SFP (2x 10GB SFP+) Switch Module
SKU: NSH-3511
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 119.99
• 4 in stock
Call if you need more
NEW Cisco C3850-NM-2-10G Catalyst 3850 4x 1GB SFP (2x 10GB SFP+) Switch Module
SKU: NSN-1789
Condition: New
Shipping: Overnight Options
Warranty: 365 days