http://www.freeaudioclips.com/
http://www.sonomic.com/

You may have to look hard on this, but it may help, http://www.archive.org/details/opensource_audio
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Here are two great resources that have .mp3 and .wav format sounds for free.

http://www.stonewashed.net/sfx.html

http://www.sounddogs.com/
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beemp3.com
http://beemp3.com/
or this site built pretty much around ringtones.
http://www.myxer.com/
Good luck.
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I specifically like www.zedge.com, not only can you preview the song, you can send a link directly to your phone to download or you can download it to your computer and then upload it to your phone. It allows for multiple options. The quality of the songs are at a high bitrate, or so it sounds. Most all the songs that I have ever wanted as ringtones and more are on this site.

I have also used www.phonezoo.com too. I used it when I was using a different cellular provider where I had internet/data included in my plan, so it was essentialy free. Although, the quality was not very good on phonezoo.com, it works.

Hope this has helped, and good luck!
Source(s):
http://www.zedge.com
http://www.phonezoo.com

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Love this site... great aggregator for sound effects in mp3 and other formats.

Example:

Free Sound Effects
Sound effects include: Car Starts, Door Openings, Clongs, Coffee Pan, Creaks, Door Closings & Openings, Fan, Garage Door, Hanging & Picking Up Phone, Inserting Cassette, Key Sounds, Oven Door, Paper Pack, Pouring, Rain, Refrigetor, Toilet Flushing, Water Running and more.

There are a bunch of sites here with a variety of effects and effect lengths.
Source(s):
http://www.stonewashed.net/sfx.html

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http://www.a1sounddownload.com/
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use Blubster.com Some people say there is viruses but i have not had any from them also they are like Nabster but free no cost Just be careful because of copyright laws . great site i have to say all the music you want is there and there is sound affects and beats all you can dream of . also if you have a virus
program like mine i use avg it always detects the virus and gives you the option to kill it. like i said i have had no problems with it virus wise also the downloads
are fast. there all mp3

Hope you enjoy .
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This is a really good FREE website to get ringtones no lie no scam www.mytinyphone.com they have many to choose from. you simply click sent to email then type in your cell phone number and it sends it as a picture msg. no fees .

http://www.mytinyphone.com/
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My favorite place for Sound Effects is Digital Sound Effects http://www.digital-sound-effects.com

Other places for Sound Effects are: http://www.powerpoint-resources.com/sound-effects.htm

Where to Locate Sound Effects: http://www.small-business-software.net/where-to-locate-sound-effects.htm
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