For those looking for SSJ3 and SSJ4 Goku, he's up for pre-order at Agabyss. Very good store I've bought from recently (Figuarts Raditz and Monsterarts Biollante), definitely very good packaging and friendly customer service.
https://www.agabyss.com/pre-orders/
Where are they located or ship from? There is not much information on their website.