Amazon has the Amazon Basics 10' 8K DisplayPort to DisplayPort 1.4 Cable with 4K@120Hz, 8K@60Hz Video Resolution, and HDR Support for $5.69 with free shipping on $25+ or with Prime.

This cable has aaudio pass-through for uncompressed digital 7.1, 5.1 or 2 channel sound and up to 1536kHz audio sample frequency.