Your search for "n540x-16z4g8q2c-d" revealed the following:
NEW Cisco N540X-16Z4G8Q2C-D NCS 540 Series DC Router
SKU: NSN-8375
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco N540X-16Z4G8Q2C-D 16x 10GB SFP+ 8x 25GB SFP28 2x 100GB QSFP28 Router
SKU: NSB-0638
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days