After the recent posts I've seen about people getting pirated copies of the game, I've decided to let people know how they can obtain Terraria for free legally. It's en extremely cheap game as it is, but I do understand that some people still can't afford it. There is a legal alternative...SteamGifts.com
is a website which holds drawings for games to be gifted on steam, not just Terraria, but I've seen Terraria on it many many times. It's completely free and legit. You CAN
win games for doing nothing more than clicking a mouse. I have won before.
Please check it out, it's all secure, it uses the Steam OpenID system to log you in. That means you actually just log in through Steam, that website never knows your password.
Here's one for Terraria right here: http://www.steamgifts.com/giveaway/GMWZj/terraria
It's only 10 points, which you will have upon creating an account at the website.