Swapping out a lock is no big deal. A pair of pliers and a wrench should do it. (the wrench actually might be overkill) Now if you had to drill out a lock, from the horror stories ive been told, thats not fun. I don't know about ordering from happs, ive never done it before. But look around here for part venders. Iam sure someone will happily hook you up for a decent price.
-Seven7-