Here is a list of some sites with free sounds for home use (or almost free).

FindSounds - Search the Web for Sounds (http://www.findsounds.com/)
Flash Kit, A Flash Developer Resource for Macromedia Flash 8 and MX Tutorials SWF FLA images clipart Sounds WAVS Animations Help and Support (http://www.flashkit.com/soundfx/)
freesound :: home page (http://www.freesound.org)
Sound Effects, Production Music, Royalty Free Music, MP3 AIF WAV Sound Effects (http://www.sounddogs.com/)
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[url]http://www.soundsnap.com/ (http://www.sound-ideas.com/)
Audio Resources (http://www.stevengotz.com/audio.htm)

incompetech.com has been a great source for me.

all sounds are free to use with no restrictions apart from a credit with the guy's name.
being really cheap and not wanting to pay for sound, i've found this site to be pretty damn useful. might take a while to find what you want, though...

another one
soundsnap.com