I have a Roon Nucleus v1 that directly feeds my Schiit Yggy DAC via a USB Disruptor. I recently install an HDPLEX 300W Linear Power Supply for the Nucleus and notice a distinct lowering of the noise floor. The magnitude of this lowering was less than the lowering when I went from a MacBook Pro as my Roon core and server to the Nucleus, but it was there. I then also used the LPS to feed the 5v needed for USB to the USB Disruptor and noticed a further lowering of the noise floor, with less magnitude than the installation on the Nucleus (but it was "free").
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I’m currently using a Farad Super 3 power supply for my Pink Faun transport card in my PC. It is absolutely excellent (just make sure you get the 19V option for NUC). Current price is around $650 USD (538 Euro). Shipping to US is included in this price and uses FedEx that is very fast!
Teddy Pardo has one that is cheaper at $450 and also said to be very good:
If your budget is really low, then one of the Teradak on ebay is your only option:
The Teradak is still going to be better than your cheap wal-wart stock power supply, but they are not as good as Farad / Teddy Pardo. I have used Teradak in the past for stuff like NUC or Tivo and they have definitely made a huge difference.