Your search for "Dell S4820T" revealed the following:
Dell N3248TE-ON 48x 1GB RJ45 4x 10GB SFP+ 2x 100GB QSFP28 F-B Air OS6 Switch
SKU: NSB-8625
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4148FE-ON-RA 48x 10GB SFP+ 2x 40GB QSFP+ 4x QSFP28 B-F No OS10 Switch
SKU: NSN-9967
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell N3248TE-ON-RA 48x 1GB RJ45 4x 10GB SFP+ 2x QSFP28 B-F Air OS10 Switch
SKU: NSN-9971
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S5224F-ON 24x 25GB SFP28 4x 100GB QSFP28 Front-to-Back Air OS10 Switch
SKU: NSH-9621
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell S4048T-ON 210-AHMR 48x 10GB Copper 6x 40GB QSFP+ F-B Air OS10 Switch
SKU: NSB-0132
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S5248F-ON-RA 48x 25GB SFP28 2x QSFP28-DD 4x QSFP28 B-F No OS10 Switch
SKU: NSN-9941
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4128F-ON-RA 210-ALTF 28x 10GB SFP+ 2x 100GB QSFP28 B-F No OS10 Switch
SKU: NSN-9933
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell N3248TE-ON-RA 48x 1GB RJ45 4x 10GB SFP+ 2x QSFP28 B-F Air OS6 Switch
SKU: NSN-9970
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S4148U-ON 210-ALRZ 48x 24x Uni SFP+ 2x QSFP+ 4x QSFP28 F-B No OS10 Switch
SKU: NSB-9786
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4128T-ON-RA 28x 10GB 2x 100GB QSFP28 B-F Air 210-ALTI (No OS10) Switch
SKU: NSN-9925
Condition: New
Shipping: Overnight Options
Warranty: 365 days