I just saw this today on DriveThru RPG (DTRPG) and I don’t know how long it’s been on there.
Three 97% off bundles on DriveThru RPG (DTRPG): https://www.drivethrurpg.com/featured.php?promotion_id=DTRPG-Cov19-May2020. Each of the bundles supports COVID-19 efforts by the nonprofits. All of the proceeds go to the nonprofit listed for whichever bundle(s) you choose. Each bundle has a lot of ebooks. According to the link above, it’s hundreds of titles available. I am guessing that is if you purchase two or more bundles. Rough estimate is 258 sets, but many sets include 2-4 or more files, some included 6 – 15 files, so it can easily exceed another 200+ items above the sets.
I don’t know how long these bundles will be offered. There are a wide variety of game products offered with each bundle.
First Bundle is $19.99, regular price $650.53 and supports Doctors Without Borders – Doctors Without Borders (not an affiliate link) – Doctors Without Borders (US site): https://www.doctorswithoutborders.org/