You cannot add "Cisco Catalyst 9300 - Network Essentials - switch - Managed - 24 x 10/100/1000 - rack-mountable" to the basket because the product is out of stock.
Cisco Business 350 Series CBS350-8XT – Switch – L3 – Managed – 8 x 10GBase-T + 2 x combo 10 Gigabit SFP+ – rack-mountable