You cannot add "Cisco Catalyst 9300 - Network Advantage - switch - L3 - Managed - 24 x 10/100/1000 (PoE+) - rack-mountable - PoE+ (445 W)" to the basket because the product is out of stock.
Cisco Business 250 Series CBS250-8FP-E-2G – Switch – L3 – smart – 8 x 10/100/1000 (PoE+) + 2 x combo SFP – rack-mountable – PoE+ (120 W)