The product code for Garry's Mod on Steam is usually referred to as its App ID, which is 4000. This unique identifier is used by Steam to manage the game within its store and services. If you're looking for a specific product code for activation or support purposes, it's best to refer directly to your Steam library or purchase confirmation.
Steam
Buy Garry's mod 10 off of steam.
There is, 10$ Steam
10$ through Steam
Garry's Mod has now updated and includes all features of 13 Beta
You Do Not Get Garrys Mod Serials, You Buy it Off Of Steam Which can be found at steampowered.com its usually about 21 United States Dollars
Buy it off Steam, easy.
No. Go buy it at steam...
There is no "Disk version" for garry's mod, you have to buy it from Steam
All steam games update themselves automatically.
If you use steam, right MB on the picture in steam and then delete.
Off of Steam (10$) (http://store.steampowered.com/)