preferably for steam but also for other online gaming platforms. Can you enter the name of game(s) you want then get an email alert when they go on sale?
Damn, I feel bad for being so lazy. I searched google and figured out how to do this for steam, but is there any kind of cross platform system that takes into account all online gaming sites, and possibly also games for consoles too? A game may still be full price on steam but on sale at origin for example.
Isthereanydeal.com does what you’re looking for.
Gog also has wishlists. Pretty much any platform with wishlists will do this if you just add the game to your wishlist.
But, for a central thing for all platforms, what Babale said.