Your search for "5420m-24t" revealed the following:
Extreme 5420M-24T-4YE 5420 Series 24x 1GB RJ45 4x 25GB SFP28 Switch
SKU: NSB-2938
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme 5420M-24T-4YE 5420 Series 24x 1GB RJ45 4x 25GB SFP28 Switch
SKU: NSN-8579
Condition: New
Shipping: Overnight Options
Warranty: 365 days