Your search for "FPR2K-NM" revealed the following:
NEW Cisco FPR2K-NM-8X10G FirePower 8x 10G SFP+ Firewall Module
SKU: NSN-8067
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco FPR2K-NM-8X1G FirePower 2100 Series 8x 1GB SFP Firewall Module
SKU: NSH-9917
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco FPR2K-NM-6X1SX-F FirePower 6x 1G SFP Fiber (FTW) Firewall Module
SKU: NSN-7623
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco FPR2K-NM-8X1G FirePower 2100 Series 8x Gigabit SFP Firewall Module
SKU: NSN-4788
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco FPR2K-NM-8X1G-F FirePower 2100 8x 1GB Copper (FTW) Firewall Module
SKU: NSH-9918
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco FPR2K-NM-6X1SX-F FirePower 6x 1G SFP Fiber (FTW) Firewall Module
SKU: NSB-5666
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco FPR2K-NM-8X1G-F FirePower 2100 8x 1GB Copper (FTW) Firewall Module
SKU: NSN-5578
Condition: New
Shipping: Overnight Options
Warranty: 365 days