These things come with a dinky little cooler because of the reduced power consumption, looks like you can run em up to some pretty high clocks even with the stocker (which has like 1/2 the cooling surface of an E6XXX series)..
There's probably tons of people on here that would sell you a stock one off an E6XXX cheap..
Having said that, I've used a couple of the Arctic Freezer 7's and they work good and they are sure nuff cheap.