budget AES/EBU?

Maybe you can find one of these cables on the used market close to your price range. Mostly likely, the AES/EBU versions have a similar SQ as the S/PDIF.

I upgraded from a good budget cable to the Acoustic Zen MC2 and it blew me away with the improvement it provided.  Read the universally glowing reviews.  Worth paying up a little for if you have to IMHO.  This seller apparently has an AES/EBU cable for sale in addition to the SPDIF he’s listed here.  Best of luck. 
 

https://www.usaudiomart.com/details/649210067-acoustic-zen-mc2-digital-cable/

the Carbon is a fairly good cable and is silver plated which is a non-negotioable with me for digital.

But I can highly recommend the Audio Sensibility Signature SE silver cable.  I use that between my Grimm Streamer and my Lampizator DAC.  with the strong dollar the Canadian dollar price is now less.

Jerry

Acoustic Zen Mc2 @soix recommended is great. Had it a while ago. 
Another option is DH Labs. Slightly faster and a tad leaner sounding than the Zen but also cheaper. 

Thank you.