Where can you find film for your Canon Rebel G?

The Rebel G uses standard 35mm film. I don't know what part of the world you're in, but here in the USA 35mm film is available at any camera store, as well as many supermarkets and drugstores. Of course, camera stores will have a better selection, other stores are limited to color print film.

I usually buy my color print film at a local supermarket, where it's about $1 per roll of 24 exposures.