Your search for "a901-6cz-f-a" revealed the following:
Cisco A901-6CZ-F-A ASR 901 8x 1GB RJ45 8x 1GB SFP 2x 10GB SFP+ Router Chassis
SKU: NSH-7859
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 306.99
• Only 2 remaining
Call if you need more
Cisco A901-6CZ-F-D ASR 901 Series 10GB (DC) Router Chassis
SKU: NSH-7757
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 459.99
• Only 2 remaining
Call if you need more
NEW Cisco A901-6CZ-F-A 8x 1GB RJ45 8x 1GB SFP 2x 10GB SFP+ Router Chassis
SKU: NSN-4080
Condition: New
Shipping: Overnight Options
Warranty: 365 days