Your search for "dell s4148" revealed the following:
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
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 S4128T-ON 28x 10GB Copper 2x 100GB QSFP28 F-B Air 210-ALTC OS10 Switch
SKU: NSN-1905
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
NEW Dell S5248F-ON-RA 48x 25GB SFP 2x 200GB QSFP28-DD 4x QSFP B-F OS10 Switch
SKU: NSN-8138
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell N4064 N4000 Series 48x 10GB Copper 2x 40GB QSFP+ 1x Module Slot Switch
SKU: NSN-8090
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S5248F-ON-RA 48x 25GB SFP28 2x 200GB QSFP28-DD 4x QSFP28 B-F OS10 Switch
SKU: NSB-6590
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
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 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 S4128T-ON-RA 28x 10GB Copper 2x 100GB QSFP28 B-F Air 210-ALTI OS10 Switch
SKU: NSB-6541
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days