What was the original price btw?
Mate, the Zalman should come with some of Zalman's own thermal grease, or at least other Zalman coolers come with this stuff.
It is pretty good TIM as well, really easy to apply, and has no curing time neither, the bottle I got with my Zalman had a really handy little application brush with it, like a bottle of nail varnish, so it made applying the TIM a doddle.
However, if you still want to buy TIM, I recommend AS5 or MX3.