DAC for Sonos Connect

Looking for a low cost DAC for my Sonos Connect, to be used primarily for casual listening to Tidal. Will connect with coax. Thinking about $300 used. I am aware of the limitations of Sonos, but with CD and lp as primary sources, I use Sonos for casual listening to Tidal and not willing to do all the upgrades. Hoping to find a DAC that is a particularly good match for this purpose. Thanks.