How many walking dead comics are there?
The newest volume, which just published (June 2013), is Volume 18http://zombieprank.com/the-walking-dead/how-will-the-walking-dead-end/If you want to buy printed version, you can consider buying the giant volume called the "compendium". It is as thick as a brick, enjoy!
Over 9,000 i think
This link will answer: http://en.m.wikipedia.org/wiki/The_Walking_Dead_(comic_book)