Play music from laptop over WiFi to existing audio system: how?

Interesting Auralic Mini review here:
https://darko.audio/2016/02/audiophile-grade-streaming-with-the-auralic-aries-mini/

If I was an Apple person, I think the Auralic Mini and the upgraded power supply would be a great choice. But not being able to (not wanting to) use one of its best features, the Lightning DS software, deters me from the Mini just a bit.

Also, am I right that that listing is a bit overpriced? The new price for the Mini is $549 with a 1 year Tidal subscription ($240 value). Without Tidal, the Mini is $399 (outside US). The power supply is $299 (I think). Without Tidal, it seems $550 is a bit high for a used one. Or am I wrong?

One interesting thing is that this shows the hardware I want can be built and it is in the price range I had in mind. Surely some other companies must build hardware like this too, and I'd like to find some of those offerings.
Specifically, a WiFi enabled device that connects via USB to an external DAC.

From another review of the Mini:

Here’s the big question: does it sound better than my DIY Raspberry PI streamers? Hmm, I’d say they are about the same with the PI being a whole lot cheaper. But if you want a ready-made solution, nothing beats the Aries with its great software ...
https://www.musicservertips.com/product-reviews/auralic-aries-mini/

So that gives me yet more reason to think about the HiFiBerry or even something a couple steps up from that. All these Pi solutions will let me run Linux, which is what I like.
If the HiFiBerry sounds about as good as the Auralic Mini like the reviewer says, then it is by far my preferred choice over a Chromecast Audio too.
Interesting thread. Thank you all for the ideas.

But I would imagine the audio quality of wifi connection would be inferior to that of USB simply because of the unstable nature of wireless connection. 

I cannot hear any difference. My WiFi handles up to about 1 Gbps. CD quality PCM audio over TCP/IP requires only 1.4 Mbps I think. I know it's not just bandwidth, but jitter that matters too.

I am using my PulseAudio "free" solution right now and it streams PCM audio over the network. It sounds the same as the USB cable to me. My speakers are Magneplanar 1.7i. My DAC is Onkyo P-3000R. WiFi playback has been flawless all day since I got this working.

It is wild that one can do this correctly and cost effectively so many ways using the right software on the right general purpose computing devices or buy expensive dedicated devices designed just for streaming that can cost so much more. I’ve found just use the right DAC that sounds good to you and good quality streaming software and you are in business with very high sound quality these days. Son much easier and cheaper than getting a good quality phono setup and keeping it that way. All my records and tape go straight to my music server when played these days and then they then get the nice retirement that they well deserve.

Here is yet another solution:
W3 Wireless Audio Adapter — Audioengine https://audioengineusa.com/shop/adapters/w3-wireless-audio-adapter/

From my experience you have two routes depending of what it is you want to achieve. If you really mean that you want to play from your laptop to your hifi using wifi then products like Apple Airport can do the job. That is where I started. However, that means that your laptop or phone actually is playing the music, which is transferred to your HiFi. It eats battery and eventually your music stops if you for example see a video on Facebook.

A much better solution is using a streamer, which is connected to your router and your HiFi. In that case your laptop or phone is your remote control. You will need a streamer (transporter so to say) and a DAC that converts the digital signal to the analog amplifier. You will find solutions for this, which ranges from 100 to 10.000 $. 

A requirement for me was that the streamer could do Tidal - you need to consider if such is a requirement. 

I started off with a simple solution based on a Teufel streamer and a Musical Fidelity DAC. Total cost of 500 $. Recently I upgraded to Innous streamer and RME ADI-2 DAC. The intent still to stream Tidal, but use Roon as well. Total cost around 2.000 $.