A good ESC fan

There is a guy on ebay running an ebay store called robobugs (IIRC). He has 12v fans that fit perfectly onto the MM controller with the use of 3mm self threading screws. They are the 1X1" models. I've been running these directly from my 4S lipo packs and they have held up well. Besides, they're only like $3 each. I usually order 3 or 4 at a time to save on shipping. These little things move some air too.