I got my nonda USB-C to USB 3.0 Mini Adapter from Amazon for US$9.99 (S$14).

It qualifies for AmazonGlobal Saver which gets you free shipping to Singapore if your order is above US$125.

nonda USB-C to USB 3.0 Mini Adapter - Packaging Front
nonda USB-C to USB 3.0 Mini Adapter – Packaging Front