I'm a big fan of the exceedingly unique and affordable(!!) art editions at 20x200. You can't beat $20 a pop for prints of this quality! The one above, "Paradigm Shift" by Jessica Snow, is particularly lovely, don't you think?
As an fyi, the most recent Domino has a little feature about this site and its founder Jen Berkman...
More prints from 20x200, from top: "Many Mountains" by Ky Anderson, "AA, 2007" by Jacob Magraw, and "Shill" by David Corbett