You can drop Ethan a line at:
Ethan Embry
c/o United Talent Agency
9560 Wilshire BLvd., Suite 500
Beverly Hills, CA 90212
If you have mail for Seth Green, send your letters to:
Seth Green
c/o Buffy the Vampire Slayer
c/o The Warner Bros. Television Network4000 Warner Blvd.
Burbank, CA 91522