Buy it off Of Steam.
SteamPowered.com
Its usually About 21 Dollars, Because you have to have A Source Game to go with it, Like Counter Strike: Source.
Buy Garry's mod 10 off of steam.
Garry's Mod 10
There is, 10$ Steam
Install steam (steampowered.com) and you can buy it on there. $10 and you get automatic updates through steam and servers.
technically yes, there were a few updates it is still called Garrys mod 10 though
No. Go buy it at steam...
10$ through Steam
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
There is no "Disk version" for garry's mod, you have to buy it from Steam
Buy it off Steam, easy.
gmod is 10$ at garrysmod.com
10 is better, $10 Steam