OM OTB game database

https://www.openingmaster.com/chess-databases/om-otb

The OM OTB comes with almost 9.6 million chess games. Precisely 9,640,502 human chess games ever played over the past century until May 2023. This is the biggest and most clean chess database found on the Internet. And the price remains the same as last year at 59 EUR. Within this price, you get monthly updates. Since the last period, we added more than 200K games.

via this interesting article on whether there is cheating on Titled Tuesday.