I check SteamDB increasingly more nowadays, seeing what new games can be preordered or is on sale.
I learned that Marvel Tokon can be preordered so I did that for the Ultimate Edition. Also, learned of a game called The Adventure of Elliot. Curious since it's Square-Enix, did a 5 minute look into it and it's their take on a Zelda clone.
Say less, I bought it within 5 minutes of knowing what it is.
These are my current preorders on Steam.
I'm sure that there were sites like this for the consoles when I was younger or if was just Wario64 posting on Twitter but this site is a goldmine for shyt to find.