From Amazon
DIGITUS DisplayPort adapter cable - mini DP to DP - UHD 4K/60Hz - 2m - Locking - Displayport 1.1a - Compatible with MacBook, Mac, PC
Conrad Electronic
Digitus Mini DisplayPort / DisplayPort Adapter cable Mini DisplayPort plug, DisplayPort plug 2.00 m White AK-340102-020-W DisplayPort cable
OnBuy
Digitus DisplayPort connection cable. mini DP - DP