In Korea all the retailers are doing online sales only at specific times and dates they announce. Needless to say, it's been a shitshow against bots. They've done 3 waves since release and each time they are gone from everywhere within 30 seconds.
A couple chains are doing a lottery where you can put your name in and they will choose who can buy, so that avoids the rush. However when they only have 300 available and more than 70,000 people put their name in, well, I might as well go play the real lottery!
Sales are done for the year with the current reservations being shipped out Christmas Eve. Rumors here say that the next round will be in February!!!! Hopefully that's not true, but we will see. I don't see PS5 being available in a store to randomly buy until next holiday to be honest.