I have a better idea. Rather than giving you links to ambiguous websites and then leaving you right back where you started, why not actually give you the sound?
<a href="http://denvish.net/ulf/210707/36227_slowmo.fla">http://denvish.net/ulf/210707/36227_s lowmo.fla</a>
Silveraxe
You can find quite good and special songs at <a href="http://flashkit.com/soundfx/">http://flashkit.com/soundfx/</a>. There should be a good slow-mo sound!
If you want to fond more usual sfx check out <a href="http://findsounds.com/">http://findsounds.com/</a>