Your search for "dell s4148" revealed the following:
NEW Dell S6100-ON 210-AFWW 4x Module Slot 2x 10GB SFP+ Front-to-Back Air Switch
SKU: NSN-5466
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell N1108P-ON N1100 Series 8x 1GB PoE+ RJ45 2x 1GB Combo EMC Switch
SKU: NSN-5146
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell N3248P-ON-RA 48x 1GB PoE RJ45 4x 10GB SFP+ 2x 100GB QSFP28 B-F OS6 Switch
SKU: NSB-9804
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell 210-AAWV S5000 4x Module Slot 4x 40GB QSFP+ F-B Airflow (DC) Switch
SKU: NSN-0168
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell 6MY5N For S4048-ON Front To Back Airflow Switch Fan Module
SKU: NSB-3440
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4112F-ON-RA 12x 10GB SFP+ 3x 100GB QSFP28 B-F Air OS10 Switch
SKU: NSN-9957
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 5KFVW N4000 Series 2x 40GB QSFP+ Switch Module
SKU: NSH-8069
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S5224F-ON 24x 25GB SFP28 4x 100GB QSFP28 Front-to-Back Air OS10 Switch
SKU: NSN-3887
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell N1108T-ON N1100 Series 8x 1GB RJ45 2x 1GB Combo Switch
SKU: NSH-9916
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days