you wont find a south korea for the price your looking for. ever. There are only about 3 or 4 collectors that I know of that have a south korea. I know a guy from South Korea who has 2 for sale at the moment. but they are 800 usd for the pair.You will not find anything other than game worn or game issued jerseys.
none are made for retail. your best bet is to hope South Korea plays in the 2018 olympics . Then we will probably see a limited set made by Nike if they are still making the top level and Olympic jerseys.
as far as china they will probably go for around 100 usd. there are some of the 2002 olympic jerseys out there. And some of the 2010 jerseys as well..