Unfortunately there are no cheap SEGA Master System here since they are kinda rare compared to other consoles.
You won't find it in game stores back then here. All usually were imported individually from western countries.
The cheapest one (but I still considered it expensive thanks to taxes and shipping cost) usually came from Australia since it's still not far away compared to North America or European countries.
SEGA wasn't paying attention to Indonesian market until Mega Drive and Sonic came along.
Most people here regards Mega Drive as SEGA's first console here.
Well that sucks, sorry to hear about that for you Indonisians.