“Aurender says they are in contact with Amazon”

Great news indeed. I am a Aurender user for 5 plus years and looking forward to Amazon streaming within Conductor app. 

I did sign up for Amazon HD earlier today. The HD catalog seems pretty limited at this time but their regular CD quality catalog is comparable with Tidal. Given the the aggressive pricing and vast CD quality catalog, I would give edge to Amazon HD over Tidal. 

Way to go Amazon!!!
I have the student discount Tidal subscription. Also I have the Oppo105 which has Tidal streamer build in (no need of USB). And I am lucky to have the last batch of Oppo205 (MQA decoder). As an audiophile and Tidal customer, I would stay with Tidal for a while until Amazon lower their UltraHD to $9.99 and with more 192/24 library.
I purchased and downloaded a Led Zeppelin song at 24/96 and the spectrum shows a brick wall filter at 20K like it is an upsampled redbook CD, it may be a 24/96 file but it is only about 5 Mb compared to the same song at 24/96 from HDtracks that is over 90 mB... In preferences I chose to buy and download at Ultra HD resolution. The Amazon file is also MP3.... something fishy at Amazon I think