http://cgi.ebay.com/Small-Cooling-Fa...QQcmdZViewItem
This is what I have been using. Works great. Just put a servo plg on the end of the wires and plug it into the 3rd channel on the reviever. That way you have easy disconect for maintenace. Nice and ligthweight frame on these fans also.
Any of these listed in this thread will work fine.