Your search for "Dell S4820T" revealed the following:
NEW Foxconn Dell 0W390D 2m External SAS Cable
SKU: NSN-8363
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 39.99
• Only 2 remaining
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Dell EMC C5RNH BASE-SR 10GB 850nm AFBR-709SMZ-FT2 SFP+ Transceiver
SKU: NSB-2030
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 12.99
• 69 in stock
Call if you need more
Foxconn Dell 0W390D 2m External SAS Cable
SKU: NSB-1086
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 37.99
• Only 2 remaining
Call if you need more
NEW for Dell PowerConnect 3000 Series 1U Switches WJ690 NT-3000 Rack Mount Kit
SKU: NSB-4278
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 18.99
• 151 in stock
Call if you need more
NEW Dell S4820T-RA 48x 10GB Copper 4x 40GB QSFP+ Back-to-Front Airflow Switch
SKU: NSN-8130
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4810P-AC 48x 10GB SFP+ 4x 40GB QSFP+ Front-to-Back Airflow Switch
SKU: NSN-2596
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S5248F-ON 48x 25GB SFP28 2x 200GB QSFP28-DD 4x QSFP28 F-B No OS10 Switch
SKU: NSB-9762
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4810P-AC-R XR65V 48x 10GB SFP+ 4x 40GB QSFP+ B-F Airflow Switch
SKU: NSN-0109
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S4148T-ON 48x 10GB Copper 2x 40GB QSFP+ 4x 100GB QSFP28 F-B OS10 Switch
SKU: NSH-9212
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4148T-ON 48x 10GB Copper 2x 40GB QSFP+ 4x 100GB QSFP28 F-B OS10 Switch
SKU: NSN-1907
Condition: New
Shipping: Overnight Options
Warranty: 365 days