I usually buy my parts from whoever has what i need at a given time, and that includes overseas suppliers. I have bought from all the major parts suppliers in Victoria, ie Bumper Action, Mr Pinball, PSPA and RTBB.. never had any hassles... well with the exception of my last order some red flipper rubbers were missing that i needed for a clients game. I wont name any names as to who the supplier was, but i WILL say it wasn't RTBB  I have no probs with their service 

Lately i have been buying a lot from overseas, places like Pinball Life, Mad Amusements and Great Plains Electronics. All good with these places too, have had no probs with them either.