Your search for "a900-rsp2a-128" revealed the following:
Cisco A900-RSP2A-128 ASR 900 Series 128Gbps Base Scale Route Switch Processor
SKU: NSH-6869
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco A900-RSP2A-128 ASR 900 128 Gbps Base Scale Route Switch Processor
SKU: NSN-2454
Condition: New
Shipping: Overnight Options
Warranty: 365 days