This product is either discontinued or we cannot get that from suppliers.
Cisco WS-C3850-24XS-S Catalyst 3850 24 Port 10g Fiber Switch, Rack-mountable 1U, 10 Gigabit Ethernet, Port 24 x 1 Gigabit / 10 Gigabit SFP+, Switching capacity 640 Gbps, Stacking bandwidth 480 Gbps, 9198 bytes, Power AC 120/230 V (50 - 60 Hz).
The Cisco Cisco Catalyst 3850 WS-C3850-24XS-S is a stackable enterprise level switch and integrated with 24 ports of SFP+ 10G Ethernet fibre connection with Flexible Netflow feature.