This product is either discontinued or we cannot get that from suppliers.
CISCO C1-WS3850-12XS-S One Catalyst 3850 12 Port, Device Switch - 12 ports - L3 - Managed - stackable, Rack-mountable 1U, 10 Gigabit Ethernet, Port 12 x 1 Gigabit / 10 Gigabit SFP+, Switching capacity 320 Gbps, Stacking bandwidth 480 Gbps, IPv4 routes/ NetFlow entries 24000, Power AC 120/230 V (50 - 60 Hz).
The Cisco Catalyst 3850 Series is the next generation of enterprise-class stackable Ethernet and Multigigabit Ethernet access and aggregation layer switches that provide full convergence between wired and wireless on a single platform.