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Don't buy them cheap ones. They don't last well or like water. You can get good ones here www.galls.com make sure to get the waterproof stuff.

You can also check
<a href="http://www.strobe-direct.com/index.htm" target="_blank">http://www.strobe-direct.com/index.htm</a>
<a href="http://www.lshlights.net" target="_blank">http://www.lshlights.net</a>
<a href="http://www.whelen.com" target="_blank">http://www.whelen.com</a>
<a href="http://www.strobesnmore.com" target="_blank">http://www.strobesnmore.com</a>