This is probably one of the most important and interesting issues here.
GSA-4163B seems to be on sale in Singapore, China, Japan, US, UK, Germany, Greece, and so on. In South Korea, “domestic” version is not released and only “illegal” version is imported and sold to end users in very limited quantity.
Please post whether you can find GSA-4163B and/or GSA-5163D in your country. Specify online links and prices if possible. Add tips as well, preferably for the greater buying choices of other visitors.
89,000 Won is the lowest price I could find in South Korea which is about US$85. Easy to find in Yongsan market.