Your search for "C3850-NM-8-10G" revealed the following:
Cisco C3850-NM-8-10G Catalyst 3850 8x 10GB SFP+ Switch Module
SKU: NSH-6809
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 459.99
• 6 in stock
Call if you need more
NEW Cisco C3850-NM-8-10G Catalyst 3850 8x 10GB SFP+ Switch Module
SKU: NSN-5229
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 1,163.99
• Only 2 remaining
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Cisco WS-C3850-32XS-E 24x 10GB SFP+ Switch w/ 8x 10GB SFP+ Module Included
SKU: NSH-4716
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 1,321.99
• Only 1 remaining
Call if you need more
NEW Cisco WS-C3850-32XS-E 24x 10GB SFP+ Switch w/ 8x 10GB SFP+ Mod
SKU: NSN-3599
Condition: New
Shipping: Overnight Options
Warranty: 365 days