Your search for "Dell S4820T" revealed the following:
NEW Dell S4112T-ON 12x 10GB Copper 3x 100GB QSFP28 F-B Air AC (No OS10) Switch
SKU: NSN-9954
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4112T-ON-RA 12x 10GB Copper 3x 100GB QSFP28 B-F AC (No OS10) Switch
SKU: NSN-9955
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S5212F-ON-RA 12x 25GB SFP28 3x 100GB QSFP28 B-B Air No OS10 Switch
SKU: NSN-9951
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4112F-ON 12x 10GB SFP+ 3x 100GB QSFP28 F-B Air OS10 Switch
SKU: NSN-9956
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell N1148T-ON N1100 Series 48x 1GB RJ45 4x 10GB SFP+ EMC Switch
SKU: NSN-5548
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell N1108T-ON N1100 Series 8x 1GB RJ45 2x 1GB Combo Switch
SKU: NSN-5276
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S5212F-ON-RA 12x 25GB SFP28 3x 100GB QSFP28 B-B Air No OS10 Switch
SKU: NSB-9769
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell N1124P-ON N1100 Series 24x 1GB PoE+ RJ45 4x 10GB SFP+ EMC Switch
SKU: NSH-9914
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell Z9100-ON-RA EMC Z-Series 32x 100GB QSFP28 B-F (No OS10 License) Switch
SKU: NSN-9935
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell Brocade DL-320-0005 300 Series 24x 8GB FC (16x Active) SAN Switch
SKU: NSH-6768
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days