Ceau Adi

Since Roland East Europe LTD. in Budapest was a major distributor for Hungary and Romania back in the days, I would keep an eye on the instrument advertisements that appear in Hungary because they sold plenty of them over there, therefor every once in a while a BK-9 would pop up.

Here is a link that has a potential in coming across a BK-9 or any other Roland product:
https://www.jofogas.hu/magyarorszag?q=roland

Here is an E-80 for 650 USD:
https://www.jofogas.hu/veszprem/Roland_E_80_Szintetizator_152801957.htm


Here is a G-70 for sale approx. 725 USD:
https://www.jofogas.hu/fejer/Roland_G_70_szintetizator_megkimelt_allapotban_elado_152612922.htm


Your next bet would be Poland or Germany.