is hard to believe that you will find a set of NS-690 for around $100 anywhere, let alone in Romania. Given the years behind the iron curtain, not too many imports made it to Romania. Your closest market is western Europe and I seriously doubt it you find a pair that cheap. The shipping alone will be more than that. That is the downside of good speakers, they are heavy and fragile which makes'em difficult and expensive to transport.
I am not aware of any Romanian mfg that makes any decent speakers worth of your Yamaha. I listened to some Soviet speakers once that were somewhat decent, but cannot remember the brand.