As promised by the twitter account, online sales for all of the concert goods started today. Unfortunately it is not hosted by Good Smile Company like in previous years, and is instead hosted by the King Records webshop. This means shipping overseas is not possible, but people overseas may still find ways to get them.
This is coming a bit late, I know. I wanted to ride the wave of the excitement after the season 4 & 5 announcement and get this done sooner, but it took time to organize all my thoughts. Anyway, enjoy.