Amazon currently has Bqeel USB-C to Display Port 4K 60HZ Adapter Cable for $5.39 after coupon code.
at the checkout, and the item drops to 40% off. Some people might notice a coupon button directly under the product on the product page, as well, but the code and coupon cannot be combined.
Free shipping with prime, and my account offers a $1 slow-ship digital credit.
The cord offers a lifetime warranty, as well.
I personally have this cord for my phone, and for the price, I think it works great for what I use it for. I have no complaints, so I figured I would share!