True, cutaway locks aren’t needed. I recently heard of a neat idea where you can call around various storage businesses and ask if they have cut locks from people who lost their unit. It won’t be useful to lock anything but great for practice. Unfortunately the one near me throws theirs away regularly so I need to call around more to see what I can find.
I used to use the prepaid approach a lot, but recently it seems like some companies are rejecting them. Mainly seeing it happen with subscription based services.