Your search for "c3kx-nm-10g" revealed the following:
Cisco C3KX-NM-10G 2x 10GB SFP+ 2x 1GB SFP Switch Module for 3750X and 3560X
SKU: NSH-1222
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 45.99
• Only 2 remaining
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NEW Cisco C3KX-NM-10G 2x 10GB SFP+ 2x 1GB SFP Switch Module for 3750X and 3560X
SKU: NSN-0220
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 119.99
• Only 2 remaining
Call if you need more
NEW Cisco C3KX-NM-10GT 2x 10GB RJ45 Switch Module for Catalyst 3750X and 3560X
SKU: NSN-1019
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 229.99
• Only 2 remaining
Call if you need more
Cisco C3KX-NM-10GT 2x 10GB RJ45 Switch Module for Catalyst 3750X and 3560X
SKU: NSH-1223
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 133.99
• 5 in stock
Call if you need more