For Van Gogh's work, the image itself is not really what's amazing about it. They are quite nice if that's the style you like, but if you've ever seen one of his originals up close, you can tell that it's actually more of a color bas relief made with oil paint. I find them to be exquisite in person.
If someone made Van Gogh reproductions that actually were more or less accurate in terms of the sculpturey nature of the works, I would spend at least a thousand dollars to have one of my favorites.
I don't know too many other artists that have paintings that are like Van Gogh's though, where it's not just the image, but the material that's the soul of the work.
There are lots of companies and artists that will happily do that for you. www.vangoghstudio.com for example seem to do it on fairly large scale.
+10 , saw a Van Gogh at the Hermitage Museum in St Petersburg, wasn't expecting that much physical depth in the painting itself.