Streamer only

Nothing to loose starting out using a device you already have. You can compare that to your sound otherwise via say phono and decide from there. I use all WiFi connections personally. Different steaming apps on the same device alone can make a big difference in sound. As can DACs.  The only way to know is to try listen and compare. Cost alone is often not a good indicator of actual performance.

In addition to the budget examples already cited (e.g., RPi, Wiim), there are a bunch of well regarded products that cost between $400 and $1k.  They include the iFi Zen, the Volumio Rivo, Holo Red, Pro-Ject Stream Box S2 Ultra, the Primare Np5, and probably a few others.  I have both an iFi and a Pro-Ject. 

Lumin U1 mini

OP, I tried the Bluesound Node and external LPS with good results. Reliable and easy to use.

Those who have recommended Aurender, Innous, Lumin are ignoring your price constraints. They are double and more your limits.

If your budget is $100 max then you really only have a couple of options. One is the Wiim streamer with the optical out and that will give you the best user experience but your DAC would need to have an optical input. The app interface plays a big part in how you access the music and how much you get out of a streaming service. If your DAC does not have an optical input then USB from a computer is the way to go and all it costs you is a USB cable. You certainly won't be getting anything near the sound quality you would get from a better dedicated streamer but at least you can dip your toes in and see what a service like Qobuz has to offer. Someone suggested a Raspberry Pi but from what I have read, that is not the best option for someone who is not tech savy.  I bet once you try streaming and see how much music it opens up to you, you will likely go up the food chain. Digital streaming has come a long way and is the preferred method of listening to music for many audiophiles these days.