Your search for "IE-4000-16T4G" revealed the following:
NEW Cisco IE-4000-16GT4G-E IE 4000 Series 16x 1GB RJ45 4x 1GB Combo (DC) Switch
SKU: NSN-8623
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 7,532.99
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Cisco IE-4000-16T4G-E IE 4000 Series 16x FE RJ45 4x 1GB Combo (DC) Switch
SKU: NSH-9956
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days