Knowing where to find great sounds from will save you lots of time, and just like with imagery, there are some great online libraries to choose from:
Each of these online libraries offers thousands of sound effects and music tracks at very low prices. They all have very easy-to-use search facilities, and for those of you who are aspiring to become Prezi DJs, you can use Audio Network's beats per minute calculator in your search to help you find really fast-paced tracks or relaxing slow tracks.
Of course, you can also search for sound effects and music tracks that are free to download. In some instances, this will take a little longer but ultimately it means that you and your company aren't spending a penny and achieving some great results.