The nice thing about USB-C is that its a standard, so you don't have to buy it from Apple only anymore like before. For example I have https://www.amazon.com/dp/B01K7C53K2 for $69, which is really useful: plug one cable in and everything is connected.
- USB-C to Thunderbolt 2: $49
- SanDisk SD Card USB-C Reader: $49.95
- USB-C AV Multiport Adaptor (HDMI): $69
Spend another $168 and you access to add the same ports you have now!