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I recently found out cheapter ways to send money to Korea.
1. I buy money order at the bank where my checking account is.
They charge $3 per check. This might be various across banks but it is usually cheap.
You can fill out info on the check and send it to Korea.
2. I found out that local grocery stores provide similar service.
In my case, it was Stop & Shop (customer service counter)
In fact, my bank told me about this. It is even cheaper(I think it was less than $2).
They charge per check within certain amount.
I send it by regular mail and my parents did not have any problem to cash out.
Hope this helps!