NA woods are usually pretty easy to find on KS classifieds, fauna classifieds, and turtle times. There is also a registry of breeders on woodturtle.com. I strongly urge that you only purchase captive bred wood as they aren't doing well in the wild, wild caught animals can harbor parasites, and cb turtles adapt better to captivity. Here are some links to get you started...

http://market.kingsnake.com/detail.php?cat=39&de=253263

http://www.breeders.woodturtle.com/index.html

http://www.turtletimes.com/classifieds/topic.asp?TOPIC_ID=10510

-Andrew Myers