If you can sort out how to assemble/glue/whatever the parts from flatpack, a service like ponoko.com might be a bit cheaper than full CNC shop like emachineshop.com. Pololou.com has a similar laser cutting service.
You can create flattish parts at home with some scrap plastic, cutting paitience, and a heat gun. I'm planning to construct an A500 side door (w/DE9 cutout) in this manner. I guess I could document the process when I get around to it.
