Reading through the descriptions of the different planes in the Manual of the Planes, I couldn't help but notice that these two goddesses were completely unmentioned. Kord, Moradin and Bahamut reside in Celestia, Pelor, Ioun and Erathis reside in Hestavar, and so on, but I could find no reference to Avandra or Melora.
Has there been any official word on where their "homes" are?