Are you looking to get an all new interior or used? If you want new, you'll obviously end up paying a small fortune and I would suggest checking with an appolstry (sp?) shop in your town to see how much they would charge for re-covering the seats and doors you have now. If you wanted used stuff, I would check e-bay or the Corrado Club of America's classified section:
http://www.corrado-club.com/classifieds/