The guys over at HongKiat have come up with a thorough list of websites with free sound fx available.  If you are in need of good sources or ideas for sound design you can find some sounds worth using.  Don’t expect consistent quality from all the sites, you do get what you pay for, but with this sort of variety you are bound to find something useful.

Check it out:

http://www.hongkiat.com/blog/55-great-websites-to-download-free-sound-effects/

Some examples form the list:

SoundSnap – User-submitted library of sounds

AudioMicro – A source of micro sized stock sounds and music

Sound-Effect.com -quality  hand-picked selection of sounds

FindSounds.com – a search engine for finding sounds online