OP,
I have used and can recommend: DHLabs (not White Lightning), Morrow Audio (50% sale right now), Supra Cables Trico or EFF RCA cables (dealer selling on eBay), or Pine Tree Audio which are showing promise. All could get you a very nice RCA pair that will grow with you through to "mid-fi". A couple might cost a little over your $100 limit, but only by $20 or $30