I have a perfect Cemetery Dance signed lettered "I" copy of The Exorcist and Legion by William P Blatty going up for auction today. Starts at 7:00 pm EST 10/20/2013 on eBay, the auction lasts for 7 days and will end on the 27 at the same time.

This is a no reserve auction starting at $0.99!

This link to the auction will start working as soon as the listing goes live: The Exorcist and Legion for sale on eBay

As far as we can tell, this is the only lettered copy currently available on the Internet as of the time of this posting.