buying them is the quickest. but you can get them from doing jobs (not always guaranteed) or find a sugar daddy to give you ec
The quickest way to obtain extra credits is through purchasing via the nurse. You also have a 2% chance of an ec dropping every successful job completion. If you unload on jobs four or five times a day you should make about 4-6 ec a day.
Every unload you get 1-3 (my memory could be wrong) and that's the average so sometimes u could get none some u could! :smile:
Since you were pretty clear when asking for a way to get ec without buying them, I'll suggest doing jobs, which is pretty much what everybody else suggested.