I would contact the local Japanese and Korean newspaper company's. There are usually 2-3 which have regular publishing dates during the month and their advertising costs are very reasonable. I have advertised in Vientamese papers with great success for homes within those communities. I did also advertise it to the general public on Craigslist.com.
I hope this helps and if you have any questions, please feel free to contact me.
Robert M. van der Goes