The Official Overstreet Comic Book Price Guide by Robert M. Overstreet (2006, Paperback)

For some 30 years now there's been only one source of authoritative information on comics and their current market value. This is it. If you have even a modest-sized collection you'll want this book to assess what your comics may be worth. Aside from that it's fun to browse through all the great covers. One complaint is the overabundance of dealer ads, many of which seem to say the same thing: "I'll buy your comics at the best price around." Enough already. This print version is much better than the pdf electronic version, by the way. That one is just too laborious to use.