Your search for "A903-RSP1A-55" revealed the following:
NEW Cisco A903-RSP1A-55 ASR 900 Series Base Scale Route Switch Processor
SKU: NSN-5127
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco A903-RSP1A-55 ASR 900 Series Base Scale Route Switch Processor
SKU: NSH-5744
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days