I am surprised your teacher doesn't know of any of the tailors here in the US. Onik is located in LA and is the major American tailmaker. We also have a Ronn Gunn representative and and Arthur Ashmore representative right here in America. You certainly don't need to go to Hungary or even Europe to find a competition tailsuit.

And yes you can find used tailsuits here at ballroomdancers.com and many many many other ballroom sites selling used competition costumes. try google