Your search for "ws-cac" revealed the following:

NEW Cisco UCSC-MRAID12G-4GB UCS M4 4G SAS 12G Cache Server Raid Controller

SKU: NSN-5099
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco UCSC-MRAID12G-1GB UCS 12Gbps SAS 1GB FBWC Cache Module (RAID 0/1/5/6)

SKU: NSN-8970
Condition: New
Shipping: Overnight Options
Warranty: 365 days