it usually depends on the artist. the more popular they are, the more likely the limited editions will go out of stock faster. for example, take Arashi at the moment. you will need a lightning fast internet connection and credit card at hand once the items are on stock on the website.
i know SCANDAL is a relatively new artist, right? i think there will be less of a stock issue for them. it is possible the limited editions will still be there for Christmas, but as a warning,
it's not guaranteed. i say (from past experience) to order as soon as possible. it will take the stress off completely and you don't have to go looking at 5 different websites all the time just to see if they have it.
good luck, i hope my post helped somewhat.
