Your search for "ec8404007-e6" revealed the following:
Extreme EC8404007-E6 8424GS 24x Gigabit Ethernet SFP Switch Module
SKU: NSH-9455
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 146.99
• Only 1 remaining
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NEW Extreme EC8404007-E6 8424GS 24x Gigabit Ethernet SFP Switch Module
SKU: NSN-4999
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 249.99
• Only 1 remaining
Call if you need more