Any balanced one end/rca the other interconnects?

Cardas makes an adapter.

Yes, I have a set from Audioquest, running from my Apogee mini-dac xlr outputs to the rca inputs on my Acurus DIA100 integrated amp. It seems like it was stock, not custom, as it came in a standard audioquest box. I got it from SoundCity on west 45th st in NYC. Be sure you ask for the right orientation (male/female) on both ends as per YOUR components. The first set I got was incorrect at the XLR side I believe.

Mine were ordered by my AQ dealer and I remember him answering a question about grade of wire. I went and found the box they came in & It was a Diamondback box for XLR but said nothing about RCA or it being an adapter.

As has been mentioned already most cable manufacturers will make them for you... and you won't get any real benefit from doing this beyond just using straight RCA cables... and no don't use adapters unless you HAVE to. The more connections you make the worse it gets.

That said, I have two such cables for my surround channels where the processor ends are RCA. The cables are Ultimate Cables silver series.