Your search for "CAB-STK-E-0.5M" revealed the following:
Cisco CAB-STK-E-0.5M 50cm FlexStack Stacking Cable for 2960S/SF, 2960X, 2960XR
SKU: NSB-3407
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 48.99
• 9 in stock
Call if you need more
NEW Cisco CAB-STK-E-0.5M 50cm FlexStack Stack Cable for 2960S/SF, 2960X, 2960XR
SKU: NSN-3224
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 171.99
• Only 2 remaining
Call if you need more
Cisco C2960X-HYBRID-STK FlexStack-Extended Hybrid Module for 2960X and 2960XR
SKU: NSH-9057
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco WS-C2960XR-48FPD-I 48x 1GB PoE RJ45 2x 10GB SFP+ Switch
SKU: NSN-2178
Condition: New
Shipping: Overnight Options
Warranty: 365 days