Hmmm I know of only a few for sale right now.   Anime link just 
put one in the misc section  http://anime-link.com/misc/ and 
Ed has a couple http://www.animeed.com/angel'segg.htm.  
They are understandably scarce.  The best way to find them is YJ 
but even then you only see them every month or so.  I've been 
lucky once or twice but I'm always looking!   They are my 
favorite cels!!!!  Good luck and I hope you post any you find!!!! I 
love to see them.  This is the last one I was able to get.