For those who live near Kitai Gorod or have easy access to this area, I found a really nice "niche" supermarket, where everything is ostentatiously expensive, but that has a bunch of gluten-free items spread around the shop. I spotted a few types of gluten-free pasta, gluten-free flours and gluten-free crackers within 3 minutes of strolling around, so there's probably much more! And the prices aren't as bad as the rest of the supermarket, so I would say it's really worth a look.
This supermarket is called Gastronom and you can find the email address on the website. And this is where they are located.
Beside this very very upmarket shop, there's also the 7th continent that has started selling gluten-free pasta and crackers. Well, it's usually only one pack per shop, but it is still an improvement! It is also in this shop that I had found the Daim cake which, by the way, is delicious!
They have a huge number of shops all around Moscow, the first one being on the Old Arbat.
A good day to you all and I hope you enjoy the snow as much as I do!