Where to find engines?

I have a 2002 civic ex, i want more power but i'm an everyday commuter driver, so i don't think turbo is a good idea, and i can't seem to find a supercharger... Where can i find what engines fit in my car, the prices, and where to buy them? Also, how much would it take just to swap the engines... or if you have any other suggestions, feel free to tell me.