Your search for "ISR4431" revealed the following:
Cisco ISR4431-SEC/K9 Integrated Services 4431 Security Router
SKU: NSH-5770
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 299.99
• Only 2 remaining
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Cisco ISR4431-V/K9 Integrated Services 4431 Router w/ PVDM4-64
SKU: NSH-7256
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 3,277.99
• Only 2 remaining
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Cisco ISR4431-AX/K9 ISR 4431 Application Experience Router
SKU: NSH-7081
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 582.99
• Only 2 remaining
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NEW Cisco ISR4431-SEC/K9 Integrated Services 4431 Security Router
SKU: NSN-2082
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 1,164.99
• 4 in stock
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NEW Cisco ISR4431-AX/K9 ISR 4431 Application Experience Router
SKU: NSN-6442
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 594.99
• Only 2 remaining
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NEW Cisco ISR4431-V/K9 Integrated Services 4431 Router w/ PVDM4-64
SKU: NSN-2421
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 3,349.99
• Only 1 remaining
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Cisco ISR4431/K9 4x 1GB RJ45 4x 1GB SFP 3x NIM Slot 1x ISC Slot Router
SKU: NSH-6266
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 154.99
• Only 2 remaining
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NEW Cisco ISR4431/K9 4x 1GB RJ45 4x 1GB SFP 3x NIM Slot 1x ISC Slot Router
SKU: NSN-4443
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 431.99
• Only 2 remaining
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NEW Cisco PWR-4430-POE-AC ISR 4000 Series 500W AC w/ PoE Router Power Supply
SKU: NSN-4050
Condition: New
Shipping: Overnight Options
Warranty: 365 days