I don't remember if in "Talia monster offers you can have Elf" ... of 200+ days of play i remind see it only one time, but i'm not sure. So I advice you to start a new game. It's why i always keep save all the time, for not do mistakes ^^. It's better to keep a couple of elf and "lock it", for not sell them by mistakes, for complete the quest of the x/30 elf.