I read an article about this, and thought it would be appropriate to post here. Shapeways is a company that lets you submit your 3D designs online, and they "print" them in plastic and send you the final model.
I have no idea what the cost is (I'm guessing it's reasonable), but this could come in handy for those wanting to add some nice large models to their prototypes.
I didn't go too much in-depth on their site, but it looks like you can submit your designs with hollow interiors to use less material:
http://www.shapeways.com/model/921/hollowed_gargoyle.html
That should cut down on the cost significantly.