This product is either discontinued or we cannot get that from suppliers.
Cisco Catalyst WS-C3850-24XS-E, Port 24 x 10 Gigabit Ethernet Expansion Slot, Optical Fiber, 10 Gigabit Ethernet, Network 10GBase-X, Expansion Slots-24, SFP+ Slots-24, Rack-mountable.
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.