Your search for "dell s4148" revealed the following:
NEW Dell N2048P N2000 Series 48x 1GB PoE+ RJ-45 2x 10GB SFP+ EMC Switch
SKU: NSN-2244
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S5248F-ON-RA 48x 25GB SFP28 2x 200GB QSFP28-DD 4x QSFP28 B-F No OS10 Switch
SKU: NSB-9763
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
NEW Dell S4112F-ON-RA 12x 10GB SFP+ 3x 100GB QSFP28 B-F No OS10 Switch
SKU: NSN-9959
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4128F-ON-RA 210-ALTF 28x 10GB SFP+ 2x 100GB QSFP28 B-F Air OS10 Switch
SKU: NSN-8121
Condition: New
Shipping: Overnight Options
Warranty: 365 days
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
Dell E3248P-ON 48x 1GB PoE+ RJ45 4x 10GB SFP+ 2x 100GB QSFP28 F-B Air Switch
SKU: NSB-9278
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell 210-AAWV S5000 4x Module Slot 4x 40GB QSFP+ F-B Airflow (DC) Switch
SKU: NSB-6555
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
Dell N3248TE-ON-RA 48x 1GB RJ45 4x 10GB SFP+ 2x 100GB QSFP28 B-F Air OS6 Switch
SKU: NSB-8628
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days