Fix iPhone 1st generation?

Hi, I own a 1st generation iPhone and it's working perfectly fine, except the exterior is all ruined from various adventures and unexpected visits to the floor, so I was wondering if apple still has parts for the 1st generation iPhone? Parts are fine, or a full replacement is okay as well. I am aware that my device, obviously has no warranty coverage, so there may be some costs, I understand that. I still occasionally use my original iPhone and would really love to be using a shiny, clean iPhone that most people would see as junk. I really admire the original iPhone. Can someone please help?