The $369 USD NucBox mini PC is a good alternative to the much more expensive Intel NUC models while the $269 to $399 Xpanel portable monitors can offer full sRGB or AdobeRGB coverage depending on the model.
https://www.notebookcheck.net/GMK-Black-Friday-sale-cuts-50-to-100-USD-off-the-already-inexpensive-NucBox-HTPCs-and-Xpanel-4K-portable-monitors.581856.0.html