To find this mob in-game, use BACKSPACE to open the World Search window, then enter Galifei Pingsi in the Search field and click "Search". Remember, the field is case-sensitive and must be entered exactly as shown.
Galifei Pingsi is a little snobbish and will not talk to you until you come to him to complete the quest, Meaning Behind the Rune, by embedding the rune. This appears to be his only interaction. It seems he sells nothing.