Pls Recommend Streamer Under $500 for Tidal “HiFi”

Good choice. I'm using one for one of my Roon endpoints and plan to get a couple more for other zones in my house. 

I have a similiar set up to double-dutch above.  I use a Raspberry Pi3b
(Raspberry has the Pi4 now but the 3 is more than sufficient) with a
Pi2 Design 502 Dac, with a case from their web site. $124. This can be used as a stand alone dac but is better to use for SPDIF out. I run that with Moode software, just download onto a MicroSD card and run.  Easy.  This goes into a Schiit Modi r2r Dac. $250. I run a Bubble Upnp app on Android phone or LUMIN on iPad.  You’ll need a digital cable also.  I lived with this set up for a couple years on my highly resolving system, and I don’t think you can do better for under $500.
Pi2 Design has a newer hat for a little more also. Check their web site.
All this stuff requires a DIY approach, but it isn’t difficult, and probably sounds better than commercial stuff much priced higher.
Put it this way, I upgraded the Dac to the Schiit Yggdrasil and the Raspberry / Pi2 Design setup has not held it back at all.
 I can actually hear differences between different digital connections.

Oppo105D. building in Tidal App. SACD/Blueray universal player. 

@junzhang10  the OP wants under $500.

The last post by Double Dutch is incredibly useful to me.  Thank you!