you should try asking people on Libra to get you one. Also the ginseng monsters are found in the game not in the Item mall. They are in Korea. use the search funtion and type in 'Ginseng' read the first topic that comes up and that will tell you where the ginseng monsters are. Also if you go to the Monster tab and search 'Ginseng' you will find the ginseng monster and what lvl it is. You should try asking on world on Libra is someone will get a ginseng monster for you You might get a reply faster that way.

And you topic would fit best under Libra market place since you are looking to buy a ginseng monster