I picked these up from Amazon, under 9 bucks. The USB-USBC adapter works great for things like USB3 card readers. The USB Micro-USBC also works fine for plugging in your other devices.
https://www.amazon.com/gp/product/B...ag=hawk-future-20&ascsubtag=UUwpUvbUpU3660086
https://www.amazon.com/gp/product/B...ag=hawk-future-20&ascsubtag=UUwpUvbUpU3660086