I bought a used copy last year after doing some research on the "best" edition. Opinions that I read said that the 10th edition published in 1990 was the "classic" edition, and that's the one I went with. A great site to see the variations in content between the different editions is posted at this website:<br><br>http://www.troop97.net/bshb1.htm<br><br><br>The best place to buy used books online, imho, is:<br><br>http://used.addall.com/