Almost all car radios support HD transmission. Many AV receivers do too. Today there is no need in standalone tuner - no one will buy it. But table radio do have their niche, though still diminishing with proliferation of network media players.
Getting off topic... but sort of. Aftermarket car radios are dropping HD support I think I got the last or second to last model in JVC's "Arsenal" series with HD whenever I bought not the Jeep I have now but the one before that. Ended up pulling it out because I didn't want to lose it. And if you aren't listening through an AVR but your old rack of separates or the little integrated in your spare bedroom (not like anyone we know, right?) you don't have any options.
This seems odd to me as HD radio has the potential to sound good but they aren't targeting the high end at all. I used to thoroughly enjoy one of my local NPR affiliate's subchannels late at night, but if I'm reading in bed or something I haven't had an HD tuner in the bedroom in ages. Don't even know if they're still good or not. Wait, scratch that - just looked, they're apparently off the air (WAMU-HD3 aka Intersection) and their other subchannel is floundering - apparently they were going to get dropped too and some listeners created a foundation to keep it on the air.