Try these places to find one in need of a home. :0)
http://www.1-800-save-a-pet.com/cgi-bin/public/petsearch.cgi/search_dogs_form
http://www.petharbor.com/
http://dogsindanger.com/
http://www.petfinder.com/
http://www.craigslist.org/about/cities.html
Adoption fees are not expensive
Old English Sheepdogs are great dogs, but they are not for everybody
Here is information on the breed that will help you decide whether or not this breed is right for you.
http://www.yourpurebredpuppy.com/reviews/oldenglishsheepdogs.html
http://www.akc.org/breeds/old_english_sheepdog/
http://www.dogbreedinfo.com/oldenglishsheepdog.htm
http://en.wikipedia.org/wiki/Old_English_Sheepdog