You won't get a "supercar" in any reliable shape under 200k these days. Even super sports cars command 200+.
100k gets you a Vette or a non-GT Porsche (both good sports cars) or a clapped out, shit-box R8 or similar.
150k and you can get good R8s, AMG GTs, used Aston Vantages, etc. I don't...