FWIW, Missions seasons 5-7 are fully available on drivethrurpg, and the first two missions of season 8 as well. There is always a lag between what they get out for conventions and when they publish them as pdfs. Hopefully season 8 becomes fully available soon, and season 9 starts trickling out by Christmas, but I don't know who is taking care of that side of things currently, if anyone.