Your search for "ASA5508-K9" revealed the following:
NEW Cisco ASA5508-K9 1 Gbps 8x 1GB RJ-45 FirePOWER (No Clock Issue) Firewall
SKU: NSN-3517
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco ASA5508-FTD-K9 1 Gbps 8x 1GB RJ-45 FirePOWER TD Firewall
SKU: NSH-8785
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days