Over the past year or so ConceptArt.org has been releasing a lot of downloadable art demos for very affordable prices.
I've had the opportunity to release 3 different demos so far and will hopefully have more available in the future.
There are also a number of different demos by my colleagues at Massive Black that I highly recommend if you have any interest in concept art or digital illustration.
Help feed starving artists today with your purchase :)
Click here to see the available demo downloads.