Samsung held an exclusive sale of a limited number of Galaxy Z Flip phones in its Digital Plaza stores in Seoul, prior to the official release of the phone (in Korea, pre-orders are supposed to start shipping tomorrow). Only 900 units were available, but they were all sold before the end of the day, despite the relatively high price of KRW 1.65 million.
Sales started at 10:30 local time. The Mirror Purple units were the first to run out, around 16:00. The other color option that was available, Mirror Black, lasted until around 18:00, clearly showing which is the hotter of the two colors.
Note that initially the Purple model will be produced in lower numbers, so you may have to wait a bit longer for one when ordering online. Theres also going to be a Mirror Gold version, but thats not available yet.
The Thom Browne Edition of the Samsung Galaxy Z Flip is slated to be an online exclusive, but theres talk that the same Samsung stores might also hold a limited offline sale (like they did for the Galaxy Note10+ Star Wars Edition).
Source (in Korean)