Hey. I have a 2003 celica GT. I am trying to figure out the cheapest easiest way to make it fast. I am hoping to bump it up around the 200 hp mark. i was thinking maybe a small turbo, but i can't seem to find one anywhere for it. what should i do?

Won't get you to 200 hp, but it is best bang for the buck. Get street tubing headers and a custom exhaust system with a free-flowing (not necessarily a loud) cat and muffler.

does anybody know where i can find a turbo/supercharger for my celica??

check vortec or TRD for a S/C