Talk:FGO 2016 Summer Event Re-Run/@comment-14.186.80.164-20170712190048/@comment-28209369-20170712220309

I also can't buy them, despite having cleared Salomon. I think you can only purchase them if you have both cleared Salomon and the event's first part's Main Story, just like you need to do for the challenge quest. I'm only up to Development Quest 9, so that would be my guess.