You should seriously own Bastion already, but if by some slim chance you don’t, it’s the current focus of a Humble Bundle Weekly sale, with the option of some tasty extra goodies if you pay a little more.
$1 or more will score you Bastion via Steam for PC, Mac or Linux, but beating the average ($2.65 at the time of writing) will get you a digital art pack, the soundtrack, ringtones for iPhone and Android and even the sheet music. For the true Bastion aficionado, $25 or more will also get you a Bastion Bandana, Soundtrack CD, Bastion Postcard and a Transistor Postcard, shipped free worldwide.
Humble Weekly Sale [Humble Bundle via OzBargain]