USB-C hub with a Mini DisplayPort

From TheVerge.com: USB-C hub with a Mini DisplayPort for less than 50$.

Moshi mini DisplayPort to HDMI adapter (4K)

The AppleStore sells the Moshi mini DisplayPort to HDMI adapter (4K) for less than 35$. Seems to support 4k resolution, yet no information, if it supports HDMI2 and 60Hz on 4k displays.

CSV-5300 - MST 1-3 DP Hub

The Club 3D CSV-5300 - MST 1-3 DP Hub is a hub device that receives a DisplayPort™ 1.2 MST signal from the source device and splits up and routes the video streams independently to each display device. It costs less than 120 Euros and allows you to connect three displays to one DP connector.

Sharp 32 inch 4k monitor

Sharp introduces the PN-K321, a 32 inch 4k monitor with Displayport and dual HDMI ports for less than 5500$.

miniDP to dual HDMI adapter

Zotac sell the miniDP to dual HDMI adapter for less than 40 Euros.