PC Where to buy Terraria for PC?

[Terraria_Girl_02]

when in doubt Steam...

?

 

[Tunnel King]

You can buy it

• from Steam - http://store.steampowered.com/app/105600/
• from GOG.com - http://www.gog.com/game/terraria
• from the Humble Store - http://www.humblebundle.com/store/p/terraria_storefront

You may be able to find a retail package of the PC Terraria Collector's Edition online somewhere (this version requires a Steam account).

eta - oops, thought this was the first page since it seems resolved/answered, I'll lock it as such.