I found out about this a few weeks ago, and I guess it will be mean of me not to share this.
If, for some reason, you are looking for a SERIES 0 (first release in April 2015) Apple Watch Edition in REAL Gold and Rose Gold, and happen to be in Japan, Apple Watch Shinjuku Isetan (the store) is having a secret sale on them for 70% off, with the final price around 400000 yen (around 3600USD), while stocks last.
You will have to speak directly to the sales people about those, there is no signage or banner indicating the sale at all. It is a secret sale for a reason.
If you crave a Apple Watch in real gold, and don’t mind the fact that the innards are the slow Series 0/S1 System-on-a-chip, then don’t miss the chance to get what is probably the first and the last Apple-made gold watch.
Thanks for a wonderful hint!