Black Friday Sale is on in the MSFS 2020 Marketplace. I assume purchases will carry over to MSFS 2024 eventually.
Edit: it showed up in MSFS 2024 within a few minutes of my MSFS 2020 purchase.
Edit 2: it’s worth comparing prices between the Marketplace, direct from developers, and from other shop platforms (Orbx, Contrail etc). I’m seeing quite a lot of variation! For example the Flying Iron sale on their website is better value than the Marketplace reductions - so I finally snapped up the P-38L!