It is tough to find a USB-C to DisplayPort Cable or USB-C to DisplayPort Adapter. I have not found any physical stores in Singapore selling it yet. Instead, you have to get it from online stores like Lazada or Amazon.

For USB-C to DisplayPort cable, I bought mine from Amazon as there are more choices to choose from.

Plugable USB-C to DisplayPort Cable - Packaging
Plugable USB-C to DisplayPort Cable – Packaging