How often Garry's Mod goes on sale?

Hey guys,

I wanna buy Garry’s Mod for my buddy to play together, but I first need a discount, so wanted to ask how often Garry’s Mod goes on sale? And when does it go on sale?

With Halloween, the game is currently on promotion on Steam.

It goes on sale during each main Steam sale, it’s currently 6.69eur/usd.

You can follow prices for Gmod or in fact any steam games here - Garry’s Mod · AppID: 4000 · SteamDB