hello burn and welcome to the forum.
if you don't want to kill one of the "plague" victim you may use pickpocket lvl 2 after one of the 3 is cured.
you can't create a third cure except with the duplication cheat.
for lockpick there is a thief who sells them in verdistis... the one who gives the quests about his magic lockpick...can't remember his name. I think the orc member of the council of seven sell them to IIRC (not so sure).
