In the early 90's a set of Dark Sun art prints were given to game store owners to promote the unique art of Dark Sun. We got a set of the prints and have scanned them for your pleasure.
For a massive book of his art:
"This Brom hardcover art book will be the largest, most comprehensive retrospective ever published on this renowned dark fantasy artist. "
Take a look at the kickstarter. There are a couple of levels for signed prints and sketches, if you're interested in that. It's already funded, with well over a month to go. Book delivery set for June 2013, about 10 months from now.