I wouldn't be surprised if they were available to people who preordered the Japanese Prime figures in Japan from e-Hobby. I'm just speculating though. Randy
According to the tweet, anyone who buys AM1-6 from them basically gets one sticker sheet per figure. The stickers are designed to augment various AM figures.
LOL - First stickers on the JP Transformers Prime RID figures and now this. I think Takara has caught on to how much people like Reprolabels stickers.