Best Digital USB cables under $ 300.00 ??

This USB cable from LavriCables offers high-end build features (including separate runs for data and power and 5N silver conductors) for much less than you’ll find elsewhere.  They don’t list USB-C as a standard connector, but I know they’re open to building custom cables so wouldn’t surprise me if they might be able to accommodate you for your specific needs so worth an email I’d think. 

https://www.lavricables.com/cables/ultimate-silver-dual-usb-a-b-interconnect-cable/

Another option would be the DHLabs Mirage that looks like it offers USB-C as an option…

https://www.thecableco.com/cables/usb-cable/mirage-usb-cable.html

Best of luck. 

DH Labs Mirage is a great cable.   Separate power / data insulation .  Sounds great between my Aurender N200 and Lab 12 DAC.    

I also have their D750 and  Air Matrix cryo RCA.  Really good cables for the money

Check out Wireworld Starlight. Great performing cables for not a lot of money. I like the earlier DH labs recommendation, too.

In my opinion Wireworld hands down!

I heard improvement in my system when I moved to Chord Clearway cables.