Hey there!
I didn’t see any announcement or topic on the forum regarding this, but till November 29 with Steam’s Autumn sales a lot of CoG and HG games are on sale there. So I figured that would be a great occasion to grab some of the titles you’re missing, if you weren’t aware of that promotion!
Kindly note that after purchasing a game on Steam you can redeem it on your CoG account too, here’s the procedure:
With Steam’s Winter Sales the games on both Choice of Games and Hosted Games labels are again on sale, so that could be a great occasion to get some CYOA games for Christmas!