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 a Prezi DJ you can use Audio Networks 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 means that you and your company aren't spending a penny and achieving some great results.