Best thing would be to go to the local used material store in your area. Quite often this can be a Retro-fit store for outfits like Habitat for Humanity, etc. They take in material from old demolished buildings donated to them, and re-sell the material to the general public. The stuff is sold real cheap. I have shopped there numerous times. Whatever they make goes towards building new homes for the needy, so its a win-win situation.
Inside or outside facing door, wood, metal or fiberglass doors are easy to dress up with a little inexpensive molding. A plane steel exterior door is easily dressed up by the use of wood or plastic beed molding, shoe molding or any of the countless profiles. Simply select the look you like, paint or stain it to match the gutters, shutters and front entry door. Attach the moldings to the door in a shape you like with small screws, or use an exterior grade adhesive. I hope this helps, best of luck with your home improvement projects. Mike