There are a number of brands of film available. Some of the most popular include:
Generally speaking, you ought to stick with reputable brands of film. Sometimes, "store brands" of film are actually quite good, but always give these generic films a trial run through your camera. Take a test roll and see what kind of results you get. If you find a film that not only performs to your liking, but also is cheaper than some of the "name brands" by all means stick with it.
When I spent time in England as a student, I came across a chain of photo stores called Jessops. Not only was I very impressed by the prints I got back when I brought my Kodak film in for processing, but I also was very pleased with the photographs I took using their store brand of film.