Your search for "R0X31A" revealed the following:
HPE Aruba R0X31A CX 6400 Series Management Switch Module
SKU: NSB-2018
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 184.99
• Only 2 remaining
Call if you need more
NEW HPE Aruba R0X31A CX 6400 Series Switch Management Module
SKU: NSN-2549
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 191.99
• Only 2 remaining
Call if you need more
NEW HPE Aruba R0X26A CX 6405 Switch Chassis Bundle
SKU: NSN-8062
Condition: New
Shipping: Overnight Options
Warranty: 365 days