Expensive? I had to buy <a href="http://www.amazon.com/Statistical-Mechanics-Thermodynamics-Book-Windows/dp/019508523X/ref=sr_1_2?ie=UTF8&#38;s=books&#38;qid=1264070985&#38;sr=1-2" rel="nofollow">http://www.amazon.com/Statistical-Mechanics-Thermodynamics-B...</a><p>Half the number of pages, double the price.