I am considering buying a Surfers machine and a friend cautioned me about the zipper flipper coils being unobtainium if there is an issue.
A search here on pinside brought up two relevant topics:
Anyone do custom coil winding?
and
For impossible to find coils the options seem to be work with APB enterprises APB enterprises or wind the coil yourself.
This morning an Instructables popped up with a Do It Yourself Coil Winding Machine, that seems to be a viable alternative to using a drill.