Where can I buy high quality prints?

I need to decorate an office and am looking for large photographs or paintings.

Here’s some examples of what I’m looking for:

  • Not so long ago, I visited a "Peter Lik" store and was blown away by the quality of the paper they used (and also by the photographs). Bright areas of the pictures kept some of their brightness as the room got darker. I don’t think it is fluorescent and it is definitely not backlit, but it looks awesome. Unfortunately, it was also unbelievably expensive, mainly due to the gigantic ego of the photographer, I think. They also didn’t ship to Belgium.
  • The Verge featured the work of Simon Stålenhag. I love it so much. But sci-fi is not appropriate. Roads or cars is perfect, nature or abstract is fine, big cities not so much (but I still welcome any suggestion!) and sci-fi not at all. :(

I would rather buy prints from small artist like Stålenhag rather than people like Lik and have no interest in classic paintings like Picasso or Van Gogh.

So I’m struggling to find what I want, could you help me? :)