Your search for "vs-s720-10g" revealed the following:
Cisco VS-S720-10G-3C Catalyst 6500 Series Supervisor Engine 720
SKU: NSH-0862
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 514.99
• 29 in stock
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Cisco VS-S720-10G-3CXL Catalyst 6500 Series Supervisor Engine 720
SKU: NSH-0999
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days