Are prices higher for foreigners?

[InstaQu33n]

When it comes to getting work done in Korea, are the prices typically more costly for foreigners vs Korean citizens? 

Someone I was talking to said this is the case. If so, is there a way to get the cost cheaper? I am trying to get my finances in order to plan for a surgery early summer. 

[SpringBean]

There is said to be an average mark-up of 10% to 20% depending on the place you go to. I believe this is standard. The only way I could see getting this cost knocked off is actually becoming a citizen in Korea.