Your search for "R0X39B" revealed the following:
HPE Aruba R0X39B CX 6400 48x 1GB RJ45 4x 1GB SFP56 Switch Line Card
SKU: NSB-6464
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 452.99
• Only 2 remaining
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NEW HPE Aruba R0X39B CX 6400 48x 1GB RJ45 4x 1GB SFP56 Switch Line Card
SKU: NSN-9132
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW HPE Aruba R0X26A CX 6405 Switch Chassis Bundle
SKU: NSN-8062
Condition: New
Shipping: Overnight Options
Warranty: 365 days